Identification of two solar X-ray sources at the 22 September 1968 total eclipse

Abstract

Study of nearly 200 records of radio signal strength indicates that a major portion of the ambient D layer absorption on 22 September 1968 can be attributed to two strong X-ray sources. The hottest source was located on the eastern limb and showed evidence of cooling fromT _wien=(3.6±0.3)×10⁶K toT _wien=(2.7±0.2)×10⁶K over a 2 1/2 h period. The other source was located near the western limb and showed no appreciable temperature change during the eclipse period. Except for the apparent source decay, the sources are similar to those found at previous eclipses using similar techniques (Meisel; 1968, 1969).