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

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
Asteroseismology Jiggling the surface of a star Monday, November 8, 2010
Moon and Jupiter Inflating a giant planet Thursday, August 26, 2010
Quiet Sun II A calm and peaceful Sun Sunday, August 22, 2010
Martian Air Pondering the fate of the Martian atmosphere Thursday, January 28, 2010
Moon and Jupiter Lighting up alien skies Sunday, January 17, 2010
Speedy Star Speeding up a young star Sunday, October 18, 2009
Superstorm! Part 4 A massive attack from space Thursday, September 3, 2009
Testing Moonrocks New tests for an old Moonrock Thursday, July 23, 2009
Solar Connection Forming a connection with the Sun Tuesday, July 7, 2009
Alpha Centauri B A familiar-looking neighbor Wednesday, April 15, 2009
Northern Darkness The Sun turns out the lights Friday, March 13, 2009
Magnetars II Magnetizing a dead star Friday, March 6, 2009
Magnetars Energizing the solar system Thursday, March 5, 2009

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
A Big Bang Tuesday, September 1, 2009
Big Hand for a Little Star Monday, April 6, 2009
Magnetar Thursday, March 5, 2009
Pushing the Boundaries Sunday, October 19, 2008
Heading Out Monday, July 14, 2008
Magnetic Blast Wednesday, May 30, 2007

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