Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh42a..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH42A-01
Other
7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7519 Flares, 7534 Radio Emissions
Scientific paper
We review new information coming from detailed analysis of the time evolution of the relativistic (>40 keV) electron intensity, spectrum and anisotropy at 1 AU connected with transient solar activity. The observations we discuss were made primarily with the EPAM instrument on ACE, but they are consistent with electron data from other spacecraft such as WIND and IMP-8. We distinguish three types of electron source. Firstly there is a coronal electron source, which is typically related only to low frequency(<1 MHz) type III radio emission and has a soft spectrum. Secondly there are impulsive bursts lasting <1 hour generally associated with coronal mass ejections (CME), which also have soft spectra. Thirdly, there are sources directly associated with solar flares. The electron injection for the impulsive bursts is on average delayed by ~10 minutes from the contemporary electromagnetic signatures. The role of CMEs with the release or acceleration process is discussed. When the emission associated with the largest X-ray flares is isolated, then the electron spectrum is typically has a differential spectral index <2.5 over the range 40-300 keV. The intensity observed at 1 AU from an event selected at random may contain contributions from all three sources. In such a case, the time evolution of the spectrum and anisotropy may be very complex and therefore difficult to interpret. We discuss events where, by applying selection criteria based on the spectrum and anisotropy, we may isolate the contribution from the three separate sources. Our understanding of complex events may be helped by considering that the event may be a superposition of the three different sources; and that informed analysis of the spectrum and anisotropy is important for the correct interpretation.
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