Status Report

SOHO Pick of the Week Persistent Coronal Hole March 5, 2002

By SpaceRef Editor
March 5, 2002
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  • Higher resolution version (TIF, 1.1M)

    Coronal holes appear as dark areas of the corona when viewed in
    ultraviolet light. This extended hole has lasted through three solar
    rotations (almost 3 months- longer than most) and is one of the
    largest seen by SOHO. Although they are usually located at the poles
    of the Sun, coronal holes can occur other places as well. The
    magnetic field lines in a coronal hole extend out into the solar wind
    rather than coming back down to the Sun’s surface as they do in other
    parts of the Sun. Thus, they are often the source of strong solar
    wind gusts that carry solar particles into space and can impact the
    Earth. And holes that cross the solar equator (“transequatorial
    holes”) are most likely to have geomagnetic effects. The effect of
    this most recent coronal hole was detected by the ACE spacecraft on 5
    March 2001 as a blast of high speed solar wind that may cause aurora
    to appear at higher latitudes.

    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

  • SpaceRef staff editor.