A study of solar flare electron events from October 1972 through December 1974 from Imp 7 and 8

Details A study of solar flare electron events from October 1972 through December 1974 from Imp 7 and 8 A study of solar flare electron events from October 1972 through December 1974 from Imp 7 and 8

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7339d&link_type=abstract

Journal of Geophysical Research, Volume 84, Issue A12, p. 7339-7347

Physics

Scientific paper

Data from the Johns Hopkins University Applied Physics Laboratory Charged Particle Measurement Experiment aboard Imp H and J were searched for solar flare produced intensity increases in >0.2-MeV electrons during the 26-month period from October 1972 through December 1974. Of the 44 solar electron events found during this period, 31 were isolated for a detailed statistical study. Systemtics among the characteristics of the electron profiles (e.g., peak intensity times and count rates) and those of the associated flares (e.g., Hα onset times, Hα importance class, heliocentric coordinates, etc.) were examined, and the significant results are presented in several scatter plots. The results reveal that the time delay between the flare onset and the arrival of the peak electron intensity at 1 AU (time to maximum) is a function of the flare's deviation in heliolongitude from the solar region which was well connected to the earth via a magnetic flux tube; the well-connected flares produced electron intensity maxima in the least time. The data also show that as the flare's deviation from the well-connected region increases, soft electron events are less likely to be observed, and the peak electron intensities are markedly decreased. No dependence of the time to maximum on the flare's heliolatitude is apparent. It is also found that solar flares with larger Hα areas tend to produce harder electron events.

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