Solar He-3-rich events and nonrelativistic electron events - A new association

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Helium Isotopes, Nucleons, Solar Electrons, Solar Flares, Sun, International Sun Earth Explorers, Interplanetary Medium, Solar Radio Bursts, Telescopes

Scientific paper

In 15 months of observation by the ISEE-e spacecraft, it was found that virtually all solar greater than or approximately equal to 1.3 MeV/nucleon He-3-rich events are associated with impulsive 2 to approximately 100 keV electron events, although many electron events were not accompanied by detectable He-3 increases. Both the He-3 and the electrons exhibit nearly scatter-free propagation in the interplanetary medium, and the times of onset and maximum for the He-3 and electron increases are closely related by velocity dispersion. The electron events and their related type III solar radio bursts provide, for the first time, identification of the flares which produce the He-3-rich events. He-3 appears to be accelerated at the flash phase of solar flares along with nonrelativistic electrons.

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