A purely coronal hard X-ray event

Details A purely coronal hard X-ray event A purely coronal hard X-ray event

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..235h&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 235-240.

Astronomy and Astrophysics

Astronomy

58

Solar Corona, Solar Flares, Solar X-Rays, Spaceborne Astronomy, X Ray Spectra, Bursts, Oso-7, Solar Electrons, Type 2 Bursts, Type 4 Bursts

Scientific paper

OSO 7 observations of a hard X-ray event of coronal origin are described. This event had a duration of more than 42 min as well as an abnormally large hard/soft ratio and apparently occurred after the disappearance of a bright coronal streamer. This gradual hard X-ray event is tentatively associated with open field lines extending well above the closed loop structures that participated in the originating flare. It is noted that a gradual hardening of the hard X-ray spectral distribution occurred during the event. Physical conditions in the source are considered, and the results are compared with observations of other hard X-ray events associated with flares.

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