Solar source regions of 3HE-rich particle events

Physics

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Electromagnetic Radiation, Energetic Particles, Energy Sources, Helium Isotopes, Solar Cosmic Rays, Solar Flares, Hydrogen Ions, Interplanetary Space, Kilometer Wave Orbiting Telescope, Particle Acceleration, Solar Corona, Type 3 Bursts

Scientific paper

Hydrogen alpha X-ray, and metric and kilometric radio data to examine the solar sources of energetic 3He-rich particle events observed near earth in association with impulsive 2 to 100 keV electron events were applied. Each 3He/electron event is associated with a kilometric type 3 burst belonging to a family of such bursts characterized by similar interplanetary propagation paths from the same solar active region. The 3He/electron events correlate very well with the interplanetary low frequency radio brightnesses of these events, but progressively worse with signatures from regions closer to the Sun. When H alpha brightnings can be associated with 3He/electron events, they have onsets coinciding to within 1 min of that of the associated metric type 3 burst but are often too small to be reported. The data are consistent with the earlier idea that many type 3 bursts, the 3He/electron events, are due to particle acceleration in the corona, well above the associated H alpha and X-ray flares.

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