SOHO Pick of the Large X-1 Flare Explodes

Status Report From: Goddard Space Flight Center
Posted: Wednesday, April 24, 2002

  • EIT Movie (MPEG, 1.2M).
  • LASCO Movie (MPEG, 1.8M).
  • EIT Movie (Quicktime, 4.7M), smaller version (Quicktime, 1.4M).
  • LASCO Movie (Quicktime, 4.5M), smaller version (Quicktime, 1.4M).
  • Higher resolution version of EIT (TIF, 1.7M)
  • Higher resolution version of C3 (TIF, 5.2M)

    Early on April 21, 2002, a large (X-1) flare and a partial halo coronal mass ejection (CME) exploded out from the Sun from near its west (right) limb. At 5:36 UT, not long after the flare, one can see bright loops in the ultraviolet EIT 195 ANSGTROM image near the source of the flare. One can also observe the pronounced proton storm of high-energy particles at about the same time in the LASCO C3 image taken in visible light. The accompanying coronal mass ejection can also be seen in the image and movie as clouds of expanding particles. The front edge of the CME reached Earth just two days later and did generate some auroral activity. The proton storming continued for well over two days, though by April 23 is now showing signs of lessening.

    CME shock front as it passes the SOHO spacecraft early on April 23, 2002.

    Previous Picks of the Week

    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

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