The X-ray and extreme ultraviolet radiation of the August 28, 1966 proton flare as deduced from sudden ionospheric disturbance data
✍ Scribed by R. F. Donnelly
- Publisher
- Springer
- Year
- 1968
- Tongue
- English
- Weight
- 183 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0038-0938
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✦ Synopsis
Ionospheric data show that a very large burst of extreme ultraviolet radiation of about 7 ergs cm 2 sec-1 above the earth's atmosphere occurred during the proton flare of August 28, 1966. The time dependence of this burst agrees closely with the 8800 and 10 700 MHz solar radio bursts and does not agree with solar radio bursts at frequencies less than 2800 MHz. The soft X-ray enhancement deduced from ionospheric data peaked about 4 min after the EUV burst.
Sudden ionospheric disturbances (SID) associated with the solar flare of 1522 UT, August 28, 1966 have been analyzed to deduce the flare enhancements of soft X-ray (1-100 A) and extreme ultraviolet radiation (100-1030 A). The ionospheric disturbance data include sudden frequency deviations (SFD), from which estimates of the flare radiation in the 10-1030 A. range are obtained, and sudden cosmic noise absorptions (SCNA), shortwave fadeouts (SWF), and sudden phase anomalies (SPA), from which estimates of the radiation in the 1-10 A range are obtained. The methods of analysis of the ionospheric data, the assumptions involved and the limitations on the accuracy of the radiation estimates are discussed in detail elsewhere (DONNELLY, 1968). Only general comments are made on the analysis here in order that emphasis be placed on results relevant to solar physics. DODSON and HEDEMAN (1968) have discussed the Ha observations of this proton flare in detail.