Multi-spacecraft observations of solar hard X-ray bursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bursts, Solar Flares, Solar X-Rays, Spaceborne Astronomy, Astronomical Models, Heao 1, Helios 2, International Sun Earth Explorer 3, Pioneer Venus 1 Spacecraft, Solar Corona, Solar Wind, X Ray Spectra

Scientific paper

The role of multi-spacecraft observations in solar flare research is examined from the point of view of solar hard X-ray bursts and their implications with respect to models of the impulsive phase. Multi-spacecraft measurements provide a stereoscopic view of the flare region, and hence represent the only direct method of measuring directivity of X-rays. In absence of hard X-ray imaging instruments with high spatial and temporal resolution, multi-spacecraft measurements provide the only means of determining the radial (vertical) structure of the hard X-ray source. This potential of the multi-spacecraft observations is illustrated with an analysis of the presently available observations of solar hard X-ray bursts made simultaneously by two or more of the following spacecraft: International Sun Earth Explorer-3, Pioneer Venus Orbiter, Helios-B and High Energy Astrophysical Observatory-A.

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