Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh41b0753l&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH41B-0753
Physics
2111 Ejecta, Driver Gases, And Magnetic Clouds, 2118 Energetic Particles, Solar, 2134 Interplanetary Magnetic Fields, 7509 Corona
Scientific paper
A fast, bright, full-halo CME, characterised by emission around all 360 degrees of the occulting disk, was observed late on August 15th 2001 by the LASCO white-light coronagraphs onboard SOHO, and was followed within an hour by an intense proton storm at 1 AU. Such a sequence of events is normally indicative of an earth-directed event with a source region on the near-side solar disk close to the notional footpoints of IMF field lines connecting to 1 AU at the event time. However, EUV images of the low corona from EIT, also onboard SOHO, show no significant activity whatsoever. Also, during the event the X-ray flux, as monitored by GOES, was low and decreasing. Thus it seems likely that the source region was located on the far-side. We speculate that it was a known active region that had traversed the west limb a week previously, thus placing it close to central meridian at the time of event onset. The subsequent activity from this region after it had traversed the east limb a week later support this picture. We discuss the nature and timeline of the event in detail, and consider implications for the generation of particles at 1 AU, particularly in terms of the fluxes and spectra observed.
Lawrence Gareth R.
Thompson Barbara J.
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