A study of the solar injection for nine scatter-free impulsive electron events

Details A study of the solar injection for nine scatter-free impulsive electron events A study of the solar injection for nine scatter-free impulsive electron events

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh41a..03w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH41A-03

Statistics

7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7519 Flares, 7534 Radio Emissions

Scientific paper

Using WIND/3DP electron data from 1996 through 2005, we investigate the injection at the Sun of nine scatter- free impulsive electron events with good count statistics, the electron energy range from ~1keV to above 60 keV and the simple association with the solar and interplanetary type III radio burst observed by WIND/WAVES. Taking into account the effects of interplanetary propagation and instrumental response, we find that the observed time profiles of electron fluxes at all energies fit quite well to triangular injections at the Sun with equal rise and fall times. We find double injections: One for <~ 1 to 6-9 keV electrons begins 4.6± 2.6 min before the start of type III burst and lasts for an averaged duration of 90 min, while a second for electrons above 9-13 keV starts 6.9±0.7 min after the start of the type III burst and lasts for an average of 24 min. Electrons of low-energy injection are likely to be the source of the type III burst. The majority of events might have a B or C class GOES SXR flare related to the start of low-energy electron injection, three might have a B or C class SXR flare related to the start of high-energy injection, and five might have a west- limb CME with the velocity <~600km/s.

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