Energetic protons from a disappearing solar filament

Computer Science

Scientific paper

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Energetic Particles, Ions, Particle Acceleration, Solar Corona, Solar Flares, Solar Protons, Coronagraphs, Ejection, International Sun Earth Explorers, Satellite-Borne Instruments, Solar Magnetic Field

Scientific paper

A solar energetic (E 50 MeV) particle (SEP) event observed at 1 AU began about 15000 UT on 1981 December 5. This event was associated with a fast coronal mass ejection observed with the Solwind coronagraph on the P78-1 satellite. No metric type 2 or type 4 burst was observed, but a weak interplanetary type 2 burst was observed with the low frequency radio experiment on the International Sun-Earth Explorer-3 satellite. The mass ejection was associated with the eruption of a large solar quiescent filament which lay well away from any active regions. The eruption resulted in an H alpha double ribbon structure which straddled the magnetic inversion line. No impulsive phase was obvious in either the H alpha or the microwave observations. This event indicates that neither a detectable impulsive phase nor a strong or complex magnetic field is necessary for the production of energetic ions.

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