The solar flare event on 1990 May 24 - Evidence for two separate particle accelerations

Details The solar flare event on 1990 May 24 - Evidence for two separate particle accelerations The solar flare event on 1990 May 24 - Evidence for two separate particle accelerations

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387l..51d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 387, March 1, 1992, p. L51-L54.

Astronomy and Astrophysics

Astrophysics

8

Particle Acceleration, Solar Cosmic Rays, Solar Flares, Solar Neutrons, H Alpha Line, Solar Radio Emission, Solar X-Rays

Scientific paper

It has been reported that direct solar neutrons were measured by cosmic-ray neutron monitors (NMs) in the first increase of the solar cosmic-ray event on 1990 May 24. A careful study of this first increase led to the conclusion that there were no solar neutrons detected by the North American NMs. A semi-quantitative analysis of the records of a few NM stations with good response to the first and/or the second increase suggests that the first increase beginning during the interval 2045-2050 UT was produced by solar protons presumably accelerated at the sun in the impulsive phase of the flare; and that the second larger increase which started no earlier than 2105 UT was probably due to solar protons accelerated by an extended coronal shock. The paper reports preliminary results of an analysis of this solar cosmic-ray event which provides evidence for two entirely separate accelerations of protons from two separate particle populations at the sun.

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