Stereoscopic Observations of a Solar Hard X-Ray Flare with Ulysses, PVO, GRO and YOHKOH Spacecraft

Details Stereoscopic Observations of a Solar Hard X-Ray Flare with Ulysses, PVO, GRO and YOHKOH Spacecraft Stereoscopic Observations of a Solar Hard X-Ray Flare with Ulysses, PVO, GRO and YOHKOH Spacecraft

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2307k&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #23.07; Bulletin of the American Astronomical Society, Vol. 24, p.760

Astronomy and Astrophysics

Astronomy

Scientific paper

Hard X-ray/gamma-ray spectrometers aboard two interplanetary spacecraft, Ulysses and Pioneer Venus Orbiter (PVO), and two near-Earth spacecraft, Yohkoh and Compton Gamma Ray Observatory (GRO/BATSE), are currently in operation. A unique set of circumstances have permitted the observation of the 15 November 1991 (2238 UT) flare by all the four instruments. This intense flare (GOES class X 1.5) was associated with the bright (3B) H-alpha flare located on the disk (S13, W19) in the active region 6919. At the time of the flare, the Ulysses and PVO spacecraft were located respectively 101(deg) and 52(deg) west of the Sun-Earth line. Thus the view angles for the PVO and Ulysses instruments were quite different from those of the near-Earth instruments on GRO and Yohkoh. The preliminary photon energy spectra observed by the four instruments at different times during the flare will be presented and their implications regarding the directivity of hard X-ray sources in flares will be discussed. (*) Retired

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