Measuring the Asymmetry of Halo CMEs

Details Measuring the Asymmetry of Halo CMEs Measuring the Asymmetry of Halo CMEs

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0492w&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0492

Other

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2788 Storms And Substorms, 7509 Corona, 7513 Coronal Mass Ejections

Scientific paper

Coronal mass ejections (CMEs) which appear to mostly or completely surround the occulting disk of a coronagraph during their outward propagation are likely to have a significant amount of mass directed along the Sun-Earth line. Such "halo" CMEs that are also associated with surface activity on the frontside of the solar disk are likely to be Earth-directed and geoeffective to some degree. Halo CMEs which are symmetrical about the LASCO C2 or C3 occulting disks, of which the Sun-centered 14 July 2000 event is the prototype, are well associated with later geomagnetic storms. Other less symmetrical halo CMEs, however, can accompany flares and other activity offset toward the solar limb. Thus, for space weather purposes it is useful to develop an objective method for determining the degree of asymmetry of a halo CME and its direction. We have developed such a technique and will provide results evaluating its utility as a space weather tool, for example, by comparison with geoactivity indices. Our computerized method also permits automatic detection of asymmetrical CMEs. This technique for detection and measurement of the asymmetry of halo CMEs will be applicable to images returned from the SMEI mission, to be launched in early 2003.

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