HR: 1330h
AN: SH42B-0522    [PDF]
TI: A scenario for three "homologous" CMEs from AR 8038 in May 1997
AU: * Li, Y
EM: yanli@ssl.berkeley.edu
AF: SSL/UC Berleley, Space Sciences Lab, University of California, 7 Gauss way, Berkeley, CA 94720 United States
AU: Luhmann, J G
AF: SSL/UC Berleley, Space Sciences Lab, University of California, 7 Gauss way, Berkeley, CA 94720 United States
AU: Hudson, H
AF: SSL/UC Berleley, Space Sciences Lab, University of California, 7 Gauss way, Berkeley, CA 94720 United States
AB: The halo CME event of May 12, 1997 has been exceptionally well-documented, in part because of the Sun-to-Earth coverage afforded by the combination of comprehensive SOHO imaging, ground-based observations, and WIND spacecraft in-situ measurements, but also because it exhibited what some regard as a classic set of event signatures with exceptional clarity: C-class flare, Halo CME, coronal double dimming, EIT wave, type II radio burst, energetic particles, magnetic cloud, and moderate geomagnetic storm. One problem with interpreting halo CMEs is the head-on view. While the STEREO twin-spacecraft mission is aimed at resolving the question of what a halo event looks like from the side, and visualizations based on numerical simulations suggest a number of possible interpretations, nature has provided an opportunity in the form of nearly homologous events initiated at the same active region AR 8038. One is at the east limb on May 5, another near the west limb on May 16. Being shortly after the solar minimum, the Sun is very quiet and the coronal magnetic field is simple. During the entire disk passage of AR8038, it is the only active region present. We take advantage of this period to make a first comparison of the three similar events at different view angles. We also model the geometry of the CME in 3D, and discuss improved physical parameters such as the speed.
UR: http://sprg.ssl.berkeley.edu/~yanli/cism/may97.html
DE: 2111 Ejecta, driver gases, and magnetic clouds
DE: 7509 Corona
DE: 7513 Coronal mass ejections
DE: 7519 Flares
DE: 7524 Magnetic fields
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting