Evidence for thin-target X-ray emission in a small solar flare on 26 February 1972
✍ Scribed by D. W. Datlowe; R. P. Lin
- Publisher
- Springer
- Year
- 1973
- Tongue
- English
- Weight
- 364 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0038-0938
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✦ Synopsis
We compare solar X-ray observations from the UCSD experiment aboard OSO-7 with high resolution energetic electron observations from the UCAL experiment on IMP-6 for a small solar flare on 26 February 1972. A proportional counter and NaI scintillator covered the X-ray energy range 5-300 keV, while a semiconductor detector telescope covered electrons from 18 to ~ 400 keV. A series of four non-thermal X-ray spikes were observed from 1805 to 1814 UT with average spectrum dJ/d (hv) ~ (hv) -4-~ over the 14-64 keV range. The energetic e/ectrons were observed at 1 AU beginning 1840 UT with a spectrum dJ/dE N E-8.1. If the electrons which produce the X-ray emission and those observed at 1 AU are assumed to originate in a common source, then these observations are consistent with thin target X-ray production at the Sun and inconsistent with thick target production. Under a model consistent with the observed soft X-ray emission, we obtain quantitative estimates of the total energy, total number, escape efficiency, and energy lost in collisions for the energetic electrons.