Search for Energetic Protons in the Impulsive Phase of Stellar Flares - AU MIC

Details Search for Energetic Protons in the Impulsive Phase of Stellar Flares - AU MIC Search for Energetic Protons in the Impulsive Phase of Stellar Flares - AU MIC

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2321w&link_type=abstract

HST Proposal ID #2321

Physics

Hst Proposal Id #2321

Scientific paper

We propose to search for energetic protons in stellar flares, by monitoring the stellar H Lyman alpha profile with high time resolution. Protons accelerated in a flare may dominate the total energy released, but have not previously been observed below 1 Mev. In the impulsive phase, predictions show that some of the 10-300 kev protons accelerated down into the stellar chromosphere will charge-exchange with neutral hydrogen and emit Lyman alpha photons in the red wing, up to 20a from line center. Impulsive bursts may last from 0.5- 30 sec, spread over several minutes. Simultaneous observations of transition region, chromospheric, and coronal lines will identify the impulsive phase, and provide measurements of the emission measure, temperature distribution, and density. Observations of AU Mic totalling 6 hours with GHRS in medium resolution mode (R= 20000), to cover 1198-1234 A with 0.4 sec time resolution are required.

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