Pick of The Week
 
 

A Pair of CMEs (November 26, 2002)

  
Images
Images
High-res version (TIF,2.3M)
High-res version (TIF,1.0M)
Movies
Movies
C2 CME (MPEG,443K)
EIT 195 (Quicktime,381K)
C2 CME (Quicktime,1.3M)
EIT 195 (Quicktime,2.8M)
C2 CME (Quicktime,378K)
EIT 195 (Quicktime,548K)
SOHO's LASCO C2 instrument observed two coronal mass ejections (CMEs) over an 18-hour period 24-25 November 2002. A comparison of the two suggests two rather different kinds of events that seem to originate from the same region. The first CME appears and disappears from the field of view rather suddenly, within about four hours. And, its fainter cloud of particles extends across a wide area. The second tighter and brighter CME takes much longer to brighten and gather itself before finally surging away in the 9:54 UT frame. The source of the first CME was an eruptive prominence clearly seen lifting off from the surface in the extreme ultraviolet (EIT 195) movie for the area over a six-hour period. The source of the second CME is not clear, though neither CME appears likely to impact the Earth.

CMEs eject a billion tons of particles traveling one to two millions of miles an hour. The dark disk blocks the Sun so that the LASCO instrument can observe the structures of the corona in visible light - structures a billion times fainter than the disk of the Sun.

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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.

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