Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33b..04d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33B-04
Physics
7514 Energetic Particles (2114), 7519 Flares, 7807 Charged Particle Motion And Acceleration, 7859 Transport Processes, 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
An unusual sequence of 18 low-energy solar electron bursts were observed by ACE/SWEPAM and Genesis/GEM at energies less than 1.4 keV over the three day period from 29 April--1 May 2002. Nine bursts occurred on 29 April, five bursts occurred on 30 April, and four bursts occurred on 1 May. This burst sequence represents almost 20% of all solar electron bursts observed in this energy range during 2002. Many of these were small bursts and detected only down to 987 eV, although a burst on 1 May extended all the way down to 197 eV. Coincident with these bursts, from 16 UT on 29 April 2002 until 14 UT on 1 May 2002 the suprathermal electron pitch-angle distribution was broader than average at all energies from 73--1370 eV. In fact, at 987 eV, the pitch-angle distribution width generally remained greater than 50° for almost 36 hours, from 00 UT on 30 Apr until 12 UT on 1 May. This is considerably broader than the pre- and post-event width of less than 20°. In addition, the persistent broadness of the pitch-angle distribution is strikingly unusual. Although suprathermal electrons often exhibit broadened pitch-angle distributions during solar electron bursts, in general the distribution narrows after the burst has ended. However, during this interval it appears that the sequence of bursts set up a scattering mechanism which persisted even between bursts. We characterize the suprathermal electron distributions at energies between 73--1370 eV during this unusual interval. We focus on the magnitude and duration of solar electron bursts, the pitch-angle distribution width, the in-situ energy spectrum, and when possible, the burst peak energy spectrum. Finally, we discuss the implications of these observations for the particle scattering mechanisms that act to broaden the suprathermal electron pitch-angle distribution.
de Koning Curt A.
Gosling Jack T.
Skoug Ruth M.
Steinberg John T.
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