De-occultation x-ray events of 2 December, 1967
Abstract
A flare rising from behind the solar limb was recorded simultaneously by the UCSD X-ray detector on OSO-III (7.7–200 keV) and the Caltech photoheliograph on Robinson Laboratory roof (Hα). The de-occultation gives excellent spatial resolution of the X-ray source. Spectra suggest that the material was already heated to 27 000 000° and that the increase in flux was due to the de-occultation. The flux rise to maximum was proportional to the apparent area. The uniformity of this rise shows that there was no special kernel of emission. Comparison of the deduced volume with the bremsstrahlung formula gives a density of about 10¹⁰ for the 27 000 000° component of the flare; this is confirmed by consideration of the maximum possible coulomb braking. The actual decay is more likely by escape rather than coulomb braking.
Additional Information
© 1969 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 11 April 1969; Issue Date October 1969. This work was supported by the National Aeronautics and Space Administration under grant NASA NGR 05 002 034, and the National Science Foundation under Grant 1472 (H.Z. and W.I.) and by NASA Contract NAS5-3177 (H.H. and D.M.). We wish to thank Prof. L. E. Peterson and Mr. D. A. Schwartz for encouragement and valuable suggestions.Attached Files
Published - 1969SoPh____9__269Z.pdf
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Additional details
- Eprint ID
- 104177
- Resolver ID
- CaltechAUTHORS:20200701-073803862
- NGR 05 002 034
- NASA
- 1472
- NSF
- NAS5-3177
- NASA
- Created
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2020-07-01Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field