Solar Observing Optical Network
The Solar Observing Optical Network (SOON) consists of three U.S. Air Force (USAF) Air Force Weather Agency (AFWA) solar observatories. AFWA operates a solar telescope at each site to monitor solar active regions at optical wavelengths. The National Geophysical Data Center (NGDC) archives histograms of intensity versus area every minute for the active regions. It also archives magnetograms of the magnetic field structure and tachograms of plasma velocities on an irregular schedule.
- RAAF Learmonth, Western Australia, Australia
- Holloman AFB, New Mexico, USA
- San Vito dei Normanni Air Station, San Vito dei Normanni, Italy (contractor-run site)
There is an active Consolidated Repair Activity (CRA) based out of Holloman Air Force Base, New Mexico which is operated by the 49th Communications Squadron. The CRA provides depot-level maintenance and support to the SOON program. The CRA also develops maintenance procedures, institutes physical (non-software) updates, and overhauls all three telescopes on a regular basis.
The basic SOON telescope is a 25 cm (9.8 in) evacuated refractor mounted on a polar axis. It has a tunable monochromatic filter centered on the hydrogen-alpha absorption line at 6,562.8 ångströms (656.28 nanometers) in the Sun's light spectrum. Shifting the filter's characteristics slightly away from the center of the H-alpha peak results in pictures of the solar surface region at differing depths. Corresponding to the optical images of solar regions are the digital "brightness-area" data. These data are often plotted as brightness-area histograms for a particular time or, in a 3-3-dimensional display, showing a time sequence of changing intensity of optical emissions from areas of solar active regions. The automatic capability of the SOON telescope system allows the rapid collection of this brightness-area information on many active regions on the sun. By using these data, quantitative measures can be determined, include instability, growth/decay rates, and precise dimensions for each active solar region.
Improved Solar Observing Optical Network
- Radio Solar Telescope Network
- Global Oscillation Network Group
- GOES Solar X-ray Imager
- Synoptic Optical Long-term Investigations of the Sun
- "Factsheets: 2nd Weather Squadron, Solar Observing Optical Network". United States Air Force Weather Agency. Retrieved 2011-10-14.
- "Solar Brightness and Magnetic Discontinuities Collected by the Solar Observing Optical Network (SOON)". National Geophysical Data Center. Retrieved 2011-10-14.
- "Improved Solar Observing Optical Network". National Solar Observatory. Retrieved 2013-02-27.
- USDOC/NOAA/NESDIS/National Geophysical Data Center (NGDC) Home Page
- Space Weather Operations from the Air Force Weather Agency