Coronal mass ejection

From Wikipedia, the free encyclopedia
  (Redirected from Coronal mass ejections)
Jump to navigation Jump to search

Coronal mass ejections are usually visible in white-light coronagraphs. Here, the white circle represents the size of the Sun.

A coronal mass ejection (CME) is a significant release of plasma and accompanying magnetic field from the Sun's corona into the solar wind. CMEs are often associated with solar flares and other forms of solar activity, but a broadly accepted theoretical understanding of these relationships has not been established.[1][2][3]

If a CME enters interplanetary space, it is referred to as an interplanetary coronal mass ejection (ICME). ICMEs are capable of reaching and colliding with Earth's magnetosphere, where they can cause geomagnetic storms, aurorae, and in rare cases damage to electrical power grids. The largest recorded geomagnetic perturbation, resulting presumably from a CME, was the solar storm of 1859. Also known as the Carrington Event, it disabled parts of the at the time newly created United States telegraph network, starting fires and shocking some telegraph operators.[4]

Near solar maxima, the Sun produces about three CMEs every day, whereas near solar minima, there is about one CME every five days.[5]

Physical properties[edit]

A video of a series of filament and prominence eruptions during solar cycle 24.

CMEs release large quantities of matter and magnetic flux away from the Sun's atmosphere and into the solar wind and interplanetary space. The ejected matter is a plasma consisting primarily of electrons and protons embedded within the ejected magnetic field. This magnetic field is commonly in the form of a flux rope, a helical magnetic field with changing pitch angles.

CMEs can typically be observed in white-light coronagraphs via Thomson scattering of sunlight off of free electrons within the CME plasma.[6] A typical CME may have any or all of three distinctive features: a dense core, a surrounding cavity of low electron density, and a bright leading edge.[7] The dense core is usually interpreted as a prominence embedded in the CME (see § Eruptive prominences) with the leading edge as an area of compressed plasma ahead of the CME flux rope. However, some CMEs exhibit more complex geometry.[8]

Most ejections originate from active regions on the Sun's surface, such as groupings of sunspots associated with frequent flares. These regions have closed magnetic field lines, in which the magnetic field strength is large enough to contain the plasma. These field lines must be broken or weakened for the ejection to escape from the Sun. However, CMEs may also be initiated in quiet surface regions, although in many cases the quiet region was recently active. During solar minimum, CMEs form primarily in the coronal streamer belt near the solar magnetic equator. During solar maximum, they originate from active regions whose latitudinal distribution is more homogeneous.[citation needed]

CMEs reach velocities from 20 to 3,200 km/s (12 to 1,988 mi/s) with an average speed of 489 km/s (304 mi/s), based on SOHO/LASCO measurements between 1996 and 2003.[9] These speeds correspond to transit times from the Sun out to the mean radius of Earth's orbit of about 13 hours to 86 days (extremes), with about 3.5 days as the average. The average mass ejected is 1.6×1012 kg (3.5×1012 lb). However, the estimated mass values for CMEs are only lower limits, because coronagraph measurements provide only two-dimensional data. The frequency of ejections depends on the phase of the solar cycle: from about 0.2 per day near the solar minimum to 3.5 per day near the solar maximum.[10] These values are also lower limits because ejections propagating away from Earth (backside CMEs) usually cannot be detected by coronagraphs.

Current knowledge of CME kinematics indicates that the ejection starts with an initial pre-acceleration phase characterized by a slow rising motion, followed by a period of rapid acceleration away from the Sun until a near-constant velocity is reached. Some balloon CMEs, usually the slowest ones, lack this three-stage evolution, instead accelerating slowly and continuously throughout their flight. Even for CMEs with a well-defined acceleration stage, the pre-acceleration stage is often absent, or perhaps unobservable.[citation needed]

Magnetic cloud[edit]

In the solar wind, CMEs manifest as magnetic clouds. They have been defined as regions of enhanced magnetic field strength, smooth rotation of the magnetic field vector, and low proton temperature.[11] The association between CMEs and magnetic clouds was made by Burlaga et al. in 1982 when a magnetic cloud was observed by Helios-1 two days after being observed by SMM.[12] However, because observations near Earth are usually done by a single spacecraft, many CMEs are not seen as being associated with magnetic clouds. The typical structure observed for a fast CME by a satellite such as ACE is a fast-mode shock wave followed by a dense (and hot) sheath of plasma (the downstream region of the shock) and a magnetic cloud.

Other signatures of magnetic clouds are now used in addition to the one described above: among other, bidirectional superthermal electrons, unusual charge state or abundance of iron, helium, carbon, and/or oxygen.

The typical time for a magnetic cloud to move past a satellite at the L1 point is 1 day corresponding to a radius of 0.15 AU with a typical speed of 450 km/s (280 mi/s) and magnetic field strength of 20 nT.[13]

Interplanetary coronal mass ejections[edit]

Follow a CME as it passes Venus then Earth, and explore how the Sun drives Earth's winds and oceans.

ICMEs typically reach Earth one to five days after leaving the Sun. During their propagation, ICMEs interact with the solar wind and the interplanetary magnetic field (IMF). As a consequence, slow ICMEs are accelerated toward the speed of the solar wind and fast ICMEs are decelerated toward the speed of the solar wind.[14] The strongest deceleration or acceleration occurs close to the Sun, but it can continue even beyond Earth orbit (1 AU), which was observed using measurements at Mars[15] and by the Ulysses spacecraft.[16] ICMEs faster than about 500 km/s (310 mi/s) eventually drive a shock wave.[17] This happens when the speed of the ICME in the frame of reference moving with the solar wind is faster than the local fast magnetosonic speed. Such shocks have been observed directly by coronagraphs[18] in the corona, and are related to type II radio bursts. They are thought to form sometimes as low as 2 R (solar radii). They are also closely linked with the acceleration of solar energetic particles.[19]

Cause[edit]

A filament in the midst of eruption resulting in a CME.

The exact cause of CMEs is not currently known; however, it is generally thought that CMEs are caused by the destabilization of large-scale magnetic structures in the corona and the resulting reconfiguration of the coronal magnetic field.[8]

The phenomenon of magnetic reconnection is closely associated with many models of both CMEs and solar flares.[20][21] In magnetohydrodynamic theory, magnetic reconnection is the sudden rearrangement of magnetic field lines when two oppositely directed magnetic fields are brought together. Reconnection releases magnetic energy stored in the original stressed magnetic fields. These magnetic field lines can become twisted in a helical structure, with a 'right-hand twist' or a 'left-hand twist'. As the Sun's magnetic field lines become more and more twisted, CMEs appear to be a 'valve' to release the magnetic energy being built up, as evidenced by the helical structure of CMEs, that would otherwise renew itself continuously each solar cycle and eventually rip the Sun apart.[22]

On the Sun, magnetic reconnection may happen on solar arcades—a series of closely occurring loops of magnetic lines of force. These lines of force quickly reconnect into a low arcade of loops, leaving a helix of magnetic field unconnected to the rest of the arcade. The sudden release of energy during this process causes the solar flare and ejects the CME. The helical magnetic field and the material that it contains may violently expand outwards forming a CME.[23] This also explains why CMEs and solar flares typically erupt from what are known as the active regions on the Sun where magnetic fields are much stronger on average.[citation needed]

Impact on Earth[edit]

Photo from the ISS of aurora australis during a geomagnetic storm on 29 May 2010. The storm was most likely caused by a CME that had erupted from the Sun on 24 May 2010, five days prior to the storm.
This video features two model runs. One looks at a moderate CME from 2006. The second run examines the consequences of a large CME such as the Carrington-class CME of 1859.

Only a small fraction of solar coronal mass ejections result in plasma directed toward the Earth. When the ejection is directed towards Earth and reaches it as an interplanetary CME (ICME), the shock wave of traveling mass causes a geomagnetic storm that may disrupt Earth's magnetosphere, compressing it on the day side and extending the night-side magnetic tail. When the magnetosphere reconnects on the nightside, it releases power on the order of terawatt scale, which is directed back toward Earth's upper atmosphere.[citation needed] It results in events such as the March 1989 geomagnetic storm.

Solar energetic particles can cause particularly strong aurorae in large regions around Earth's magnetic poles. These are also known as the Northern Lights (aurora borealis) in the northern hemisphere, and the Southern Lights (aurora australis) in the southern hemisphere. Coronal mass ejections, along with solar flares of other origin, can disrupt radio transmissions and cause damage to satellites and electrical transmission line facilities, resulting in potentially massive and long-lasting power outages.[24][25]

Energetic protons released by a CME can cause an increase in the number of free electrons in the ionosphere, especially in the high-latitude polar regions. The increase in free electrons can enhance radio wave absorption, especially within the D-region of the ionosphere, leading to polar cap absorption events.[26]

Humans at high altitudes, as in airplanes or space stations, risk exposure to relatively intense solar particle events. The energy absorbed by astronauts is not reduced by a typical spacecraft shield design and, if any protection is provided, it would result from changes in the microscopic inhomogeneity of the energy absorption events.[27][28]

While the terrestrial effects of solar flares are very fast (limited by the speed of light), CMEs are relatively slow, developing at the Alfvén speed.[29]

Future risk[edit]

According to a report published in 2012 by physicist Pete Riley of Predictive Science Inc., the chance of Earth being hit by a Carrington-class storm between 2012 and 2022 is 12%.[30][31]

In 2019, researchers used an alternative method (Weibull distribution) and estimated the chance of Earth being hit by a Carrington-class storm in the next decade to be between .46% and 1.88%.[32]

Associated phenomena[edit]

Video of a solar filament being launched

Coronal mass ejections are often associated with other forms of solar activity, most notably:

The association of CMEs with some of those phenomena is common but not fully understood. For example, CMEs and flares are normally closely related, but there has been confusion about this point caused by events originating beyond the limb. For such events no flare could be detected.[clarification needed] Most weak flares do not have associated CMEs; most powerful ones do. Some CMEs occur without any flare-like manifestation, but these are often weaker and slower.[34] It is now thought that CMEs and associated flares are caused by a common event (the CME peak acceleration and the flare impulsive phase generally coincide). In general, all of these events (including the CME) are thought to be the result of a large-scale restructuring of the magnetic field; the presence or absence of a CME during one of these restructures would reflect the coronal environment of the process (i.e., can the eruption be confined by overlying magnetic structure, or will it simply break through and enter the solar wind).

Eruptive prominences[edit]

Eruptive prominences are associated with at least 70% of all CMEs.[35] Prominences are often embedded within the bases of flux ropes making up CMEs. The eruptive prominence corresponds with the bright core seen in white light coronagraphs.[8]

Coronal dimming[edit]

A coronal dimming is an observed decrease in extreme ultraviolet and soft X-ray emissions in the corona during the onset of some CMEs. Coronal dimmings are thought to occur predominantly due to a decrease in plasma density caused by mass outflows during the expansion of the associated CME. They often occur either in pairs located within regions of opposite magnetic polarity, a core dimming, or in a more widespread area, a secondary dimming. Core dimmings are interpreted as the footpoint locations of the erupting flux rope; secondary dimmings are interpreted as the result of the expansion of the overall CME structure and are generally more diffuse and shallow.[36]

Coronal dimming was first reported in 1974.[37] Due to their appearance resembling that of coronal holes, they were sometimes referred to as transient coronal holes.[38]

Solar radio bursts[edit]

The shock wave located at the leading edge of some CMEs can produce Type II radio bursts when the shock wave accelerates electrons. Some Type IV radio bursts are also associated with CMEs and have been observed to follow Type II bursts.[8]

History[edit]

First traces[edit]

The largest recorded geomagnetic perturbation, resulting presumably from a CME, coincided with the first-observed solar flare on 1 September 1859. The resulting solar storm of 1859 is referred to as the Carrington Event. The flare and the associated sunspots were visible to the naked eye (both as the flare itself appearing on a projection of the Sun on a screen and as an aggregate brightening of the solar disc), and the flare was independently observed by English astronomers R. C. Carrington and R. Hodgson. The geomagnetic storm was observed with the recording magnetograph at Kew Gardens. The same instrument recorded a crochet, an instantaneous perturbation of Earth's ionosphere by ionizing soft X-rays. This could not easily be understood at the time because it predated the discovery of X-rays by Röntgen and the recognition of the ionosphere by Kennelly and Heaviside. The storm took down parts of the recently created US telegraph network, starting fires and shocking some telegraph operators.[25]

Historical records were collected and new observations recorded in annual summaries by the Astronomical Society of the Pacific between 1953 and 1960.[39]

First clear detections[edit]

The first detection of a CME as such was made on 14 December 1971, by R. Tousey (1973) of the Naval Research Laboratory using the seventh Orbiting Solar Observatory (OSO-7).[40] The discovery image (256 × 256 pixels) was collected on a Secondary Electron Conduction (SEC) vidicon tube, transferred to the instrument computer after being digitized to 7 bits. Then it was compressed using a simple run-length encoding scheme and sent down to the ground at 200 bit/s. A full, uncompressed image would take 44 minutes to send down to the ground. The telemetry was sent to ground support equipment (GSE) which built up the image onto Polaroid print. David Roberts, an electronics technician working for NRL who had been responsible for the testing of the SEC-vidicon camera, was in charge of day-to-day operations. He thought that his camera had failed because certain areas of the image were much brighter than normal. But on the next image the bright area had moved away from the Sun and he immediately recognized this as being unusual and took it to his supervisor, Dr. Guenter Brueckner,[41] and then to the solar physics branch head, Dr. Tousey. Earlier observations of coronal transients or even phenomena observed visually during solar eclipses are now understood as essentially the same thing.

1989–present[edit]

On 9 March 1989 a coronal mass ejection occurred. On 13 March 1989 a severe geomagnetic storm struck the Earth. It caused power failures in Quebec, Canada and short-wave radio interference.

On 1 November 1994, NASA launched the Wind spacecraft as a solar wind monitor to orbit Earth's L1 Lagrange point as the interplanetary component of the Global Geospace Science (GGS) Program within the International Solar Terrestrial Physics (ISTP) program. The spacecraft is a spin axis-stabilized satellite that carries eight instruments measuring solar wind particles from thermal to greater than MeV energies, electromagnetic radiation from DC to 13 MHz radio waves, and gamma-rays.[citation needed]

On 25 October 2006, NASA launched STEREO, two near-identical spacecraft which, from widely separated points in their orbits, are able to produce the first stereoscopic images of CMEs and other solar activity measurements. The spacecraft orbit the Sun at distances similar to that of Earth, with one slightly ahead of Earth and the other trailing. Their separation gradually increased so that after four years they were almost diametrically opposite each other in orbit.[42][43]

On 1 August 2010, during solar cycle 24, scientists at the Harvard–Smithsonian Center for Astrophysics (CfA) observed a series of four large CMEs emanating from the Earth-facing hemisphere of the Sun. The initial CME was generated by an eruption on 1 August that was associated with NOAA Active Region 1092, which was large enough to be seen without the aid of a solar telescope. The event produced significant aurorae on Earth three days later.

On 23 July 2012, a massive, and potentially damaging, solar superstorm (solar flare, CME, solar EMP) occurred but missed Earth,[30][44] an event that many scientists consider to be Carrington-class event.

On 31 August 2012 a CME connected with Earth's magnetic environment, or magnetosphere, with a glancing blow causing aurora to appear on the night of 3 September.[45][46] Geomagnetic storming reached the G2 (Kp=6) level on NOAA's Space Weather Prediction Center scale of geomagnetic disturbances.[47][48]

14 October 2014 ICME was photographed by the Sun-watching spacecraft PROBA2 (ESA), Solar and Heliospheric Observatory (ESA/NASA), and Solar Dynamics Observatory (NASA) as it left the Sun, and STEREO-A observed its effects directly at AU. ESA's Venus Express gathered data. The CME reached Mars on 17 October and was observed by the Mars Express, MAVEN, Mars Odyssey, and Mars Science Laboratory missions. On 22 October, at 3.1 AU, it reached comet 67P/Churyumov–Gerasimenko, perfectly aligned with the Sun and Mars, and was observed by Rosetta. On 12 November, at 9.9 AU, it was observed by Cassini at Saturn. The New Horizons spacecraft was at 31.6 AU approaching Pluto when the CME passed three months after the initial eruption, and it may be detectable in the data. Voyager 2 has data that can be interpreted as the passing of the CME, 17 months after. The Curiosity rover's RAD instrument, Mars Odyssey, Rosetta and Cassini showed a sudden decrease in galactic cosmic rays (Forbush decrease) as the CME's protective bubble passed by.[49][50]

Stellar coronal mass ejections[edit]

There have been a small number of CMEs observed on other stars, all of which as of 2016 have been found on red dwarfs.[51] These have been detected by spectroscopy, most often by studying Balmer lines: the material ejected toward the observer causes asymmetry in the blue wing of the line profiles due to Doppler shift.[52] This enhancement can be seen in absorption when it occurs on the stellar disc (the material is cooler than its surrounding), and in emission when it is outside the disc. The observed projected velocities of CMEs range from ≈84 to 5,800 km/s (52 to 3,600 mi/s).[53][54] Compared to activity on the Sun, CME activity on other stars seems to be far less common.[52][55]

See also[edit]

References[edit]

  1. ^ Christian, Eric R. (5 March 2012). "Coronal Mass Ejections". NASA/Goddard Space Flight Center. Archived from the original on 10 April 2000. Retrieved 9 July 2013.
  2. ^ Hathaway, David H. (14 August 2014). "Coronal Mass Ejections". NASA/Marshall Space Flight Center. Archived from the original on 3 July 2016. Retrieved 7 July 2016.
  3. ^ "Coronal Mass Ejections". NOAA/Space Weather Prediction Center. Retrieved 7 July 2016.
  4. ^ Morring, Jr., Frank (14 January 2013). "Major Solar Event Could Devastate Power Grid". Aviation Week & Space Technology. pp. 49–50. But the most serious potential for damage rests with the transformers that maintain the proper voltage for efficient transmission of electricity through the grid.[verification needed]
  5. ^ Fox, Nicky. "Coronal Mass Ejections". NASA/International Solar-Terrestrial Physics. Retrieved 6 April 2011.
  6. ^ Howard, T. A.; DeForest, C. E. (20 June 2012). "The Thomson Surface. I. Reality and Myth" (PDF). The Astrophysical Journal. 752 (2): 130. Bibcode:2012ApJ...752..130H. doi:10.1088/0004-637X/752/2/130. Retrieved 9 December 2021.
  7. ^ Gopalswamy, N. (January 2003). "Coronal mass ejections: Initiation and detection" (PDF). Advances in Space Research. 31 (4): 869–881. Bibcode:2003AdSpR..31..869G. doi:10.1016/S0273-1177(02)00888-8. Retrieved 27 August 2021.
  8. ^ a b c d Vial, Jean-Claude; Engvold, Oddbjørn (2015). Solar Prominences. Springer. ISBN 978-3-319-10415-7.
  9. ^ Yashiro, S.; Gopalswamy, N.; Michalek, G.; Cyr, O. C. St.; Plunkett, S. P.; Rish, N. B.; Howard, R. A. (July 2004). "A catalog of white light coronal mass ejections observed by the SOHO spacecraft" (PDF). Journal of Geophysical Research: Atmospheres. doi:10.1029/2003JA010282. Retrieved 16 February 2022.
  10. ^ Carroll, Bradley W.; Ostlie, Dale A. (2007). An Introduction to Modern Astrophysics. San Francisco: Addison-Wesley. p. 390. ISBN 978-0-8053-0402-2.
  11. ^ Burlaga, L. F., E. Sittler, F. Mariani, and R. Schwenn, "Magnetic loop behind an interplanetary shock: Voyager, Helios and IMP-8 observations" in "Journal of Geophysical Research", 86, 6673, 1981
  12. ^ Burlaga, L. F. et al., "A magnetic cloud and a coronal mass ejection" in "Geophysical Research Letter"s, 9, 1317-1320, 1982
  13. ^ Lepping, R. P. et al. "Magnetic field structure of interplanetary magnetic clouds at 1 AU" in "Journal of Geophysical Research", 95, 11957-11965, 1990
  14. ^ Manoharan, P. K. (May 2006). "Evolution of Coronal Mass Ejections in the Inner Heliosphere: A Study Using White-Light and Scintillation Images". Solar Physics. 235 (1–2): 345–368. Bibcode:2006SoPh..235..345M. doi:10.1007/s11207-006-0100-y. S2CID 122757011.
  15. ^ Freiherr von Forstner, Johan L.; Guo, Jingnan; Wimmer-Schweingruber, Robert F.; et al. (January 2018). "Using Forbush Decreases to Derive the Transit Time of ICMEs Propagating from 1 AU to Mars". Journal of Geophysical Research: Space Physics. 123 (1): 39–56. arXiv:1712.07301. Bibcode:2018JGRA..123...39F. doi:10.1002/2017JA024700. S2CID 119249104.
  16. ^ Richardson, I. G. (October 2014). "Identification of Interplanetary Coronal Mass Ejections at Ulysses Using Multiple Solar Wind Signatures". Solar Physics. 289 (10): 3843–3894. Bibcode:2014SoPh..289.3843R. doi:10.1007/s11207-014-0540-8. S2CID 124355552.
  17. ^ Wilkinson, John (2012). New Eyes on the Sun: A Guide to Satellite Images and Amateur Observation. Springer. p. 98. ISBN 978-3-642-22838-4.
  18. ^ Vourlidas, A.; Wu, S. T.; Wang, A. H.; Subramanian, P.; Howard, R. A. (December 2003). "Direct Detection of a Coronal Mass Ejection-Associated Shock in Large Angle and Spectrometric Coronagraph Experiment White-Light Images". The Astrophysical Journal. 598 (2): 1392–1402. arXiv:astro-ph/0308367. Bibcode:2003ApJ...598.1392V. doi:10.1086/379098.
  19. ^ Manchester, W. B., IV; Gombosi, T. I.; De Zeeuw, D. L.; Sokolov, I. V.; Roussev, I. I.; et al. (April 2005). "Coronal Mass Ejection Shock and Sheath Structures Relevant to Particle Acceleration" (PDF). The Astrophysical Journal. 622 (2): 1225–1239. Bibcode:2005ApJ...622.1225M. doi:10.1086/427768. Archived from the original (PDF) on 5 February 2007.
  20. ^ "Scientists unlock the secrets of exploding plasma clouds on the sun". Eurekalert.org. American Physical Society. 8 November 2010. Retrieved 7 July 2016.
  21. ^ Phillips, Tony, ed. (1 March 2001). "Cannibal Coronal Mass Ejections". Science News. NASA. Retrieved 20 March 2015.
  22. ^ Green, Lucie (2014). 15 Million Degrees. Viking. p. 212. ISBN 978-0-670-92218-5.
  23. ^ Holman, Gordon D. (April 2006). "The Mysterious Origins of Solar Flares". Scientific American. 294 (4): 38–45. Bibcode:2006SciAm.294d..38H. doi:10.1038/scientificamerican0406-38. PMID 16596878.
  24. ^ Baker, Daniel N.; et al. (2008). Severe Space Weather Events—Understanding Societal and Economic Impacts: A Workshop Report. National Academies Press. p. 77. doi:10.17226/12507. ISBN 978-0-309-12769-1. These assessments indicate that severe geomagnetic storms pose a risk for long-term outages to major portions of the North American grid. John Kappenman remarked that the analysis shows "not only the potential for large-scale blackouts but, more troubling, ... the potential for permanent damage that could lead to extraordinarily long restoration times."
  25. ^ a b Morring, Jr., Frank (14 January 2013). "Major Solar Event Could Devastate Power Grid". Aviation Week & Space Technology. pp. 49–50. But the most serious potential for damage rests with the transformers that maintain the proper voltage for efficient transmission of electricity through the grid.
  26. ^ Rose, D. C.; Ziauddin, Syed (June 1962). "The Polar Cap Absorption Effect". Space Science Reviews. 1 (1): 115–134. Bibcode:1962SSRv....1..115R. doi:10.1007/BF00174638. S2CID 122220113. Retrieved 14 February 2021.
  27. ^ 13th November 2013, bbc.com: Space radiation: Should frequent flyers worry? Quote: "...Only very high-energy cosmic rays can reach our atmosphere at latitudes close to the equator...Cosmic radiation exposure levels during flights vary according to altitude, latitude and the space weather at the time...“Solar energetic particles events are difficult to assess, but being aloft at high latitudes during a big solar storm would be a large dose,” says Lockwood...", backup
  28. ^ 31 October, 2003, BBCNews: Solar storm surge 'not over yet' Quote: "... Earlier this week, aircraft traversing the north Atlantic were confined to a narrow corridor to minimise radiation exposure, and astronauts on board the International Space Station (ISS) took shelter in its most shielded section. ...", backup
  29. ^ Gleber, Max (21 September 2014). "CME Week: The Difference Between Flares and CMEs". NASA. Retrieved 7 July 2016.
  30. ^ a b Phillips, Tony (23 July 2014). "Near Miss: The Solar Superstorm of July 2012". NASA. Retrieved 26 July 2014.
  31. ^ Riley, Pete (February 2012). "On the probability of occurrence of extreme space weather events". Space Weather. American Geophysical Union. 10 (2): n/a. Bibcode:2012SpWea..10.2012R. doi:10.1029/2011SW000734.
  32. ^ Moriña, David; Serra, Isabel; Puig, Pedro; Corral, Álvaro (20 February 2019). "Probability estimation of a Carrington-like geomagnetic storm". Scientific Reports. 9 (1): 2393. doi:10.1038/s41598-019-38918-8.
  33. ^ Tomczak, M.; Chmielewska, E. (March 2012). "A Catalog of Solar X-Ray Plasma Ejections Observed by the Soft X-Ray Telescope on Board Yohkoh". The Astrophysical Journal Supplement Series. 199 (1). 10. arXiv:1201.1040. Bibcode:2012ApJS..199...10T. doi:10.1088/0067-0049/199/1/10. S2CID 119184089.
  34. ^ Andrews, M. D. (December 2003). "A Search for CMEs Associated with Big Flares". Solar Physics. 218 (1): 261–279. Bibcode:2003SoPh..218..261A. doi:10.1023/B:SOLA.0000013039.69550.bf. S2CID 122381553.
  35. ^ Gopalswamy, N.; Shimojo, M.; Lu, W.; Yashiro, S.; Shibasaki, K.; Howard, R. A. (20 March 2003). "Prominence Eruptions and Coronal Mass Ejection: A Statistical Study Using Microwave Observations". The Astrophysical Journal. 586 (1): 562–578. doi:10.1086/367614.
  36. ^ Cheng, J. X.; Qiu, J. (2016). "The Nature of CME-Flare-Associated Coronal Dimming". The Astrophysical Journal. 825. doi:10.3847/0004-637X/825/1/37. Retrieved 6 June 2022.
  37. ^ Hansen, Richard T.; Garcia, Charles J.; Hansen, Shirley F.; Yasukawa, Eric (April 1974). "Abrupt Depletions of the Inner Corona". Publications of the Astronomical Society of the Pacific. 86: 300. doi:10.1086/129638. Retrieved 6 June 2022.
  38. ^ Vanninathan, Kamalam; Veronig, Astrid M.; Dissauer, Karin; Temmer, Manuela (2018). "Plasma Diagnostics of Coronal Dimming Events". The Astrophysical Journal. 857: 62. doi:10.3847/1538-4357/aab09a. Retrieved 6 June 2022.
  39. ^ Astronomical Society of the Pacific Visual Records
  40. ^ Howard, Russell A. (October 2006). "A Historical Perspective on Coronal Mass Ejections" (PDF). Solar Eruptions and Energetic Particles. Geophysical Monograph Series. Vol. 165. American Geophysical Union. p. 7. Bibcode:2006GMS...165....7H. doi:10.1029/165GM03. ISBN 9781118666203.
  41. ^ Howard, Russell A. (1999). "Obituary: Guenter E. Brueckner, 1934-1998". Bulletin of the American Astronomical Society. 31 (5): 1596. Bibcode:1999BAAS...31.1596H.
  42. ^ "Spacecraft go to film Sun in 3D". BBC News. 26 October 2006.
  43. ^ "STEREO". NASA.
  44. ^ "ScienceCasts: Carrington-class CME Narrowly Misses Earth". YouTube.com. NASA. 28 April 2014. Archived from the original on 12 December 2021. Retrieved 26 July 2014.
  45. ^ "NASA's SDO Sees Massive Filament Erupt on Sun". NASA. 4 September 2012. Retrieved 11 September 2012.
  46. ^ "August 31, 2012 Magnificent CME". NASA/Goddard Space Flight Center. 31 August 2012. Retrieved 11 September 2012.
  47. ^ "Space Weather Alerts and Warnings Timeline: September 1–16, 2012 (archive)". NOAA. Archived from the original on 28 September 2012. Retrieved 24 September 2012.
  48. ^ Chillymanjaro (6 September 2012). "Geomagnetic storming levels back to normal". The Watchers. Retrieved 11 September 2012.
  49. ^ Witasse, O.; Sánchez-Cano, B.; Mays, M. L.; Kajdič, P.; Opgenoorth, H.; et al. (14 August 2017). "Interplanetary coronal mass ejection observed at STEREO-A, Mars, comet 67P/Churyumov-Gerasimenko, Saturn, and New Horizons en route to Pluto: Comparison of its Forbush decreases at 1.4, 3.1, and 9.9 AU". Journal of Geophysical Research: Space Physics. 122 (8): 7865–7890. Bibcode:2017JGRA..122.7865W. doi:10.1002/2017JA023884.
  50. ^ "Tracking a solar eruption through the Solar System". SpaceDaily. 17 August 2017. Retrieved 22 August 2017.
  51. ^ Korhonen, Heidi; Vida, Krisztian; Leitzinger, Martin; et al. (20 December 2016). "Hunting for Stellar Coronal Mass Ejections". Proceedings of the International Astronomical Union. 12: 198–203. arXiv:1612.06643. doi:10.1017/S1743921317003969. S2CID 119459397.
  52. ^ a b Vida, K.; Kriskovics, L.; Oláh, K.; et al. (May 2016). "Investigating magnetic activity in very stable stellar magnetic fields. Long-term photometric and spectroscopic study of the fully convective M4 dwarf V374 Pegasi". Astronomy & Astrophysics. 590. A11. arXiv:1603.00867. Bibcode:2016A&A...590A..11V. doi:10.1051/0004-6361/201527925. S2CID 119089463.
  53. ^ Leitzinger, M.; Odert, P.; Ribas, I.; et al. (December 2011). "Search for indications of stellar mass ejections using FUV spectra". Astronomy & Astrophysics. 536. A62. Bibcode:2011A&A...536A..62L. doi:10.1051/0004-6361/201015985.
  54. ^ Houdebine, E. R.; Foing, B. H.; Rodonò, M. (November 1990). "Dynamics of flares on late-type dMe stars: I. Flare mass ejections and stellar evolution". Astronomy & Astrophysics. 238 (1–2): 249–255. Bibcode:1990A&A...238..249H.
  55. ^ Leitzinger, M.; Odert, P.; Greimel, R.; et al. (September 2014). "A search for flares and mass ejections on young late-type stars in the open cluster Blanco-1". Monthly Notices of the Royal Astronomical Society. 443 (1): 898–910. arXiv:1406.2734. Bibcode:2014MNRAS.443..898L. doi:10.1093/mnras/stu1161. S2CID 118587398.

Further reading[edit]

Books[edit]

  • Gopalswamy, Natchimuthukonar; Mewaldt, Richard; Torsti, Jarmo (2006). Gopalswamy, Natchimuthukonar; Mewaldt, Richard A.; Torsti, Jarmo (eds.). Solar Eruptions and Energetic Particles. Washington DC American Geophysical Union Geophysical Monograph Series. Geophysical Monograph Series. Vol. 165. American Geophysical Union. Bibcode:2006GMS...165.....G. doi:10.1029/GM165. ISBN 0-87590-430-0.

Internet articles[edit]

External links[edit]