Evidence for intense coronal prompt gamma-ray line emission from a solar flare

Details Evidence for intense coronal prompt gamma-ray line emission from a solar flare Evidence for intense coronal prompt gamma-ray line emission from a solar flare

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425l.109b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 2, p. L109-L112

Astronomy and Astrophysics

Astronomy

26

Gamma Ray Astronomy, Gamma Rays, Solar Corona, Solar Flares, Solar X-Rays, X Ray Astronomy, Astronomical Satellites, Electromagnetic Radiation, Solar Atmosphere, Solar Radiation, Spaceborne Astronomy

Scientific paper

We present hard X-ray/gamma-ray measurements, obtained with the PHEBUS experiment onboard GRANAT, of the intense solar flare which occurred on 1991 June 1 at 14:56 UT beyond the east limb. The gamma-ray spectrum displays strong prompt lines in the 1-2 and 4-7 MeV energy ranges but no significant neutron capture line. Although the flare location prevents emission at heights below (3000-7000) km from being observed, the total fluence due to prompt nuclear lines in the 4-7 MeV range is found to be one of the largest measured so far. We argue that the prompt gamma-ray line emission takes place in the lower corona at densities below (1011 to 5 x 1011)/cu cm.

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