Magnetism and Magnetic Fields

Magnetism is a force field generated by moving electrical charges. An electrical current running through a loop of wire generates a magnetic field. The strength of the field depends on the current and area of the wire loop. Plasma churning through the atmosphere of the Sun drives powerful magnetic fields that sometimes produce cool magnetic storms called sunspots. A magnetic dynamo underneath Earth's crust generates a magnetic field around Earth.

Radio Programs

EV Lacertae A tiny star with a big temper Friday, October 30, 2015
Making a Magnetar Making a powerful magnet Thursday, August 6, 2015
Magnetars Powering up some strong magnets Wednesday, August 5, 2015
Whistlers Listening for stormy skies Thursday, September 19, 2013
Sunquakes Rumbling through the Sun Sunday, June 9, 2013
At the Edge At the edge of the solar system Saturday, June 8, 2013
Solar Twins A star that looks familiar Saturday, June 1, 2013
Magnetic Directions Navigating with an internal compass Tuesday, April 9, 2013
Magnetic Earth Earth’s changing magnetic field Monday, April 8, 2013
Moon and Saturn Wrapped in a magnetic embrace Friday, March 1, 2013
Superflares Super explosions on other stars Wednesday, January 23, 2013
Moon and Regulus Brightening up the Moon Wednesday, October 10, 2012
Vega A star that spins in a hurry Monday, July 9, 2012
Interstellar Skies Looking for clear interstellar skies Tuesday, November 15, 2011
Near the Edge Nearing the edge of the solar system Monday, November 14, 2011
Juno Looking into the heart of a giant Monday, August 1, 2011
Moon and Jupiter Shielding an entire planet Saturday, May 28, 2011
AMS-2 Looking for antimatter Tuesday, April 19, 2011
Last Ride Shuttling a big magnet into space Monday, April 18, 2011
Messenger at Mercury II Probing a planetary bowling ball Wednesday, March 16, 2011

Featured Images

Supercomputer simulations of Earth's magnetic field
Twist and Flip Monday, April 8, 2013
Cassini views Saturn's magnetic field
Solar Sculptor Friday, March 1, 2013
A January 23, 2012 solar flare
Restless Sun Monday, January 30, 2012
Loopy Sun Friday, April 23, 2010


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