Dependence of the decay phase of solar energetic electron events on the large-scale IMF structure: ACE observations

Details Dependence of the decay phase of solar energetic electron events on the large-scale IMF structure: ACE observations Dependence of the decay phase of solar energetic electron events on the large-scale IMF structure: ACE observations

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ussc1s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 21, pp. SSC 1-1, CiteID 2079, DOI 10.1029/2003GL017921

Physics

3

Interplanetary Physics: Corotating Streams, Interplanetary Physics: Energetic Particles, Heliospheric (7514), Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Wind Plasma

Scientific paper

Using recent measurements of energetic electrons (>=38 keV) by the ACE/EPAM experiment, we examine the dependence of the characteristic decay time of two impulsive solar electron events on the large-scale structure of the Interplanetary Magnetic Field (IMF) within which the electrons are emitted. The technique of mapping the solar wind and extrapolating the frozen-in magnetic field is used to obtain the large-scale IMF structure within and beyond the location of the ACE spacecraft. We find that the electron event that occurred within a converging IMF structure exhibits a remarkably longer decay phase compared to the electron event observed inside a diverging IMF configuration. The observations provide strong evidence for the location of magnetic ``barriers'' in space beyond 1 AU and their role in determining the decay phase of solar energetic electron events and the establishment and maintenance of particle reservoirs in the heliosphere.

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