Two Recent Electron-Rich Energetic Particle Events and Their Associated CMEs

Details Two Recent Electron-Rich Energetic Particle Events and Their Associated CMEs Two Recent Electron-Rich Energetic Particle Events and Their Associated CMEs

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42a0768s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH42A-0768

Other

2118 Energetic Particles, Solar, 7513 Coronal Mass Ejections, 7519 Flares

Scientific paper

Electron-rich energetic particle events were defined by Evenson et al. (1984) as a class that correlated with solar flares that produced gamma-rays. Cane et al. (1986) demonstrated that these events are associated with impulsive (i.e. compact) flares. We have identified two electron-rich energetic particle events in the IMP 8 data in cycle 23. The dates of the two events are 01-May-2000 and 10-March-2001. The March 2001 event was well-observed by Yohkoh and showed a small hard X-ray source at the flare site. The soft/hard X-ray flux ratio was low. We have also examined SOHO LASCO and EIT images to investigate other forms of solar activity. Both events appear to be associated with coronal mass ejections (CMEs) that possess somewhat unusual morphology (bright, structured material, with little evidence of leading coronal material). Moreover, the two CME events appear similar to each other, at least so far as morphology in the LASCO observations. Additionally, observations of the March 2001 CME were obtained by the ultraviolet spectrometer (UVCS) on SOHO. UVCS observed the narrow ejecta following the leading feature at several heights (from 1.7 up to 3.1 solar radii). The CME material appeared bright in cool lines of OVI (1032,1037 A doublet), CIII (977 A), Lyman-beta and Lyman-alpha. The Doppler shift suggests a very small speed along the line of sight, consistent with the CME being near the plane of the sky. We present the SOHO observations and the Yohkoh SXT images (for the 10-March-2001 impulsive flare), and we describe our results.

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