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

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.3010w&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #30.10; Bulletin of the American Astronomical Society, Vol. 24, p.777

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We present evidence for the detection of a proton beam during the impulsive phase of a flare on the Dme star AU Microscopii. At 1991 Sept 3 04h 56m 10s UT, the Goddard High Resolution Spectrograph on the Hubble Space Telescope observed an increase in the flux in the red wing of the hydrogen Lyman alpha line at 1223A, unaccompanied by an increase in the blue wing, simultaneously with an increase in the flux of the SiIII 1206A transition region line. The 1223A flux increase was 2.2 x 1027 ergs s-1 A-1, with 3s duration. The chance probability of the observation is 1 in 105. This effect was predicted by Orrall and Zirker (1976), as a downstreaming beam of protons charge exchanging with ambient neutral hydrogen and emitting Lyman alpha radiation at the downstreaming velocity. The energy in the beam is estimated as 7 x 1029 ergs s-1.

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