Orders of magnitude (magnetic field)

This page lists examples of magnetic field B in teslas and gauss produced by various sources. They are grouped by orders of magnitude, and each section covers three orders of magnitude, or a factor of one thousand.

Note:

• Traditionally, magnetizing field H, is measured in amperes per meter. Magnetic field B (also known as magnetic flux density or magnetic induction) has SI units teslas. One tesla is equal to 10⁴ gauss.
• Magnetic field drops off as the cube of the distance from the source (for a dipole). These examples attempt to make the measuring point clear, usually the surface of the item mentioned.

List of orders of magnitude for magnetic fields

Factor (tesla)	SI prefix	Value	Value (prefixGauss)	Item
10−18	attotesla	5 aT	50 fG	SQUID magnetometers on Gravity Probe B gyros measure fields at this level over several days of averaged measurements
10−15	femtotesla	2 fT	20 pG	SQUID magnetometers on Gravity Probe B gyros measure fields at this level in about one second
10−12	picotesla	0.1 - 1.0 pT	1 - 10 nG	human brain magnetic field
10−11		1.0×10−11	100 nG	In September 2006, NASA found "potholes" in the magnetic field in the heliosheath around our solar system that are 10 picoteslas as reported by Voyager 1
10−9	nanotesla	0.1 nT to 10 nT	1 - 100 µG	magnetic field strength in the heliosphere
10−6	microtesla	24 µT	240 mG	strength of magnetic tape near tape head
10−5		31 µT	310 mG	strength of Earth's magnetic field at 0° latitude (on the equator)
		58 µT (5.8×10−5 T)	580 mG	strength of Earth's magnetic field at 50° latitude
10−3	millitesla	0.5 mT	5 G	the suggested exposure limit for cardiac pacemakers by American Conference of Governmental Industrial Hygienists (ACGIH)
		5 mT	50 G	the strength of a typical refrigerator magnet [2]
10−1		0.15 T	1.5 kG	the magnetic field strength of a sunspot
100	tesla	1 T to 2.4 T	10 - 24 kG	coil gap of a typical loudspeaker magnet.
		1.25 T	12.5 kG	strength of a modern neodymium-iron-boron (Nd2Fe14B) rare earth magnet. A coin-sized neodymium magnet can lift more than 9 kg, can pinch skin and erase credit cards.
		1.5 T to 3 T	15 - 30 kG	strength of medical magnetic resonance imaging systems in practice, experimentally up to 8 T
		9.4 T	94 kG	Modern high resolution research magnetic resonance imaging system
101		11.7 T	117 kG	field strength of a 500 MHz NMR spectrometer
		16 T	160 kG	strength used to levitate a frog
		36.2 T	362 kG	strongest continuous magnetic field produced by non-superconductive resistive magnet.
		45 T	450 kG	strongest continuous magnetic field yet produced in a laboratory (Florida State University's National High Magnetic Field Laboratory in Tallahassee, USA).
		97.4 T	974 kG	strongest (pulsed) magnetic field yet obtained non-destructively in a laboratory (National High Magnetic Field Laboratory, Los Alamos National Laboratory, USA)}
102		730 T	7.3 MG	strongest pulsed magnetic field yet obtained in a laboratory, destroying the used equipment, but not the laboratory itself (Institute for Solid State Physics, Tokyo)
103	kilotesla	2.8 kT	28 MG	strongest (pulsed) magnetic field ever obtained (with explosives) in a laboratory (VNIIEF in Sarov, Russia, 1998)
106	megatesla	1 to 100 MT (106 T to 108 T)	10 - 1000 GG (0.01 - 1 TG)	strength of a neutron star
109	gigatesla	0.1 to 100 GT (108 to 1011 T)	1 - 1000 TG (0.001 - 1 PG)	strength of a magnetar