Pick of The Week
 
 

It's All in the Magnetism (October 2, 2003)


Hi-res TIF image (1.0M)

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The Sun on 25 September 2003 had a few sunspots mostly in one group that appeared as dark areas on the surface when viewed in visible light. These are the sites of intense magnetic fields emerging from the Sun's interior. A magnetic image taken almost simultaneously reveals these clusters of activity with the black and white areas indicating north and south magnetic polarity. The magnetically active regions in which sunspots are found are often the sources of solar storms. The video clip shows the correlation of the two kinds of images as well as a close-up of the activity in the white box. All images were taken by the Michelson Doppler Imager (MDI) instrument on SOHO. The MDI also probes below the visible surface of the Sun by measuring the strengths of millions of modes of oscillation of the solar surface

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SOHO began its Weekly Pick some time after sending a weekly image or video clip to the American Museum of Natural History (Rose Center) in New York City. There, the SOHO Weekly Pick is displayed with some annotations on a large plasma display.

If your institution would also like to receive the same Weekly Pick from us for display (usually in Photoshop or QuickTime format), please send your inquiry to steele.hill@gsfc.nasa.gov.

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