AAS 204th Meeting, June 2004
Session 2 When the Sun Went Wild
SPD Topical Related Poster, Monday, May 31, 2004, 9:20am-6:30pm, Ballroom

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[2.06] Scatter-free Impulsive Electron Event from the October 28, 2003 X17 Flare

S. Krucker, R. P. Lin (Space Sciences Lab, University of California, Berkeley)

The October 28, 11 UT X-17 flare produced an impulsive electron event detected near the Earth by the WIND 3D Plasma & Energetic Particles instrument from ~200 keV down to ~1 keV, even though the flare was located around E08 and therefore unlikely to be magnetically connected to Earth. This impulsive event exhibited a fast rise and decay (~10 min each), and was followed by a second, much slower rising event that lasted for many hours. The peak times of the impulsive event show clear velocity dispersion consistent with a path length of 1.27±0.1 AU, indicating that the electron propagation is essentially scatter-free. Onset time analysis reveal that the impulsive event electrons left the Sun at 11:14±3 UT, just after the end of a group of type III bursts seen at 14 MHz (11:03-11:11 UT) and when the type II burst reaches 14 MHz. Radio pulsations at 0.6-1.3 GHz were seen between 11:14:30 and 11:22:00 UT. The velocity dispersion seen in the peak times suggests that the peak of the injection occurred around 11:25±3 UT roughly consistent with the end of the decimeter radio emission. This impulsive electron event also was observed near Mars at energies from ~1 to 20 keV by the Electron Reflectometer instrument on Mars Global Surveyor spacecraft.

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