Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..147..137t&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 147, no. 1, p. 137-155.
Astronomy and Astrophysics
Astronomy
26
Gamma Ray Astronomy, Gamma Ray Bursts, Solar Flares, Solar X-Rays, X Ray Astronomy, H Alpha Line, Temporal Distribution
Scientific paper
The Phebus experiment on board the GRANAT satellite provides temporal and spectral observations of solar and cosmic gamma-ray bursts in the 0.1-100 MeV nominal energy range. The experiment started on January 8, 1990 and is still in operation. In this paper we present the main characteristics of the Phebus experiment and describe and discuss some of the observational properties of the 18 solar hard X-ray/gamma-ray events detected during the first semester of the Phebus operation. It is found that: (1) events of a few minutes duration, detected above about 100 keV, systematically show subsecond time variations; (2) events longer than 5 min do not exhibit fast time variations and generally consist of 1-min peaks superimposed on a less intense, sometimes harder, slowly varying component. In addition to these general trends we discuss in more detail three events for which significant count-rates have been detected above 10 MeV.
Barat Claude
Dezalay Jean-Pascal
Kuznetsov Alexander
Sunyaev Rachid
Talon R.
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