Detection of a proton beam during the impulsive phase of a stellar flare

Details Detection of a proton beam during the impulsive phase of a stellar flare Detection of a proton beam during the impulsive phase of a stellar flare

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397l..95w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 397, no. 2, p. L95-L98.

Mathematics

Probability

25

Lyman Alpha Radiation, Proton Beams, Stellar Activity, Stellar Flares, Data Reduction, Electron Beams, Red Dwarf Stars

Scientific paper

A transient event consistent with the predicted temporal and spectral signatures of an energetic proton beam was detected in the impulsive phase of a small flare on the red dwarf star AU Microscopii. It consisted of a prominent increase in the flux in the red wing of Lyman-alpha near 1223 A, simultaneously with the peak of a flare observed in the 1206 A transition region line of Si III. The probability that the red wing event was a chance fluctuation is one chance in 2.5 x 10 exp 4. This observation represents a confirmation of the prediction by Orrall and Zirker (1976) in which downstreaming protons accelerated during the impulsive phase of a flare charge exchange with ambient neutral hydrogen and emit Lyman-alpha radiation from 1 to 15 A redward of line center.

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