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Determination of the source height and anisotropy of solar hard X-rays by measurements with good time resolution

✍ Scribed by Taeil Bai

Publisher: Springer
Year: 1978
Tongue: English
Weight: 208 KB
Volume: 59
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00154937

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✦ Synopsis

When emitted at the same time, solar hard X-rays reflected by the photosphere arrive at an observer at later times than primary hard X-rays coming directly from the source. This time lag of albedo photons, therefore, should be taken into account in interpreting fine-scale hard X-ray time profiles. If hard X-ray bursts consist of succession of short-lived 'elementary bursts', under favorable conditions reflected hard X-rays can be resolved from primary hard X-rays with good time resolution. If so, from the time lag and the ratio of the albedo flux to the primary flux, one can determine the source height and anisotropy of solar hard X-rays.

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Simultaneous microwave and X-ray observations are presented for a solar flare detected on May 8, 1980 starting at 19:37 UT. The X-ray observations were made with the Hard X-Ray Burst Spectrometer on the Solar Maximum Mission and covered the energy range from 28-490 keV with a time resolution of 10 m