Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh41a..02c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH41A-02
Physics
7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7519 Flares
Scientific paper
It is well established that the inferred onsets of >25~keV electrons at the Sun are delayed (typically by about 10 minutes) relative to the start times of the associated type~III radio bursts. Most researchers consider these delays as evidence of multiple electron populations and that the >25~keV electrons are a population separate from the ~10 keV electrons responsible for the radio emissions. However the energy spectra of in situ electrons do not show breaks below 25~keV. This is one of a number of reasons why separate electron populations seems extremely unlikely and why it has been suggested (Cane, ApJ 598, 1403, 2003) that the delays are primarily caused by interplanetary propagation effects. This study investigates the solar associations and delays for 87 electron beam events identified in the ACE EPAM data and includes a division of the events into classes (flare versus shock). It is found that there is no significant ordering of the delays by event class contrary to the expectation that delays only occur in large events because of the importance of shocks at the Sun.
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