Physics
Scientific paper
Dec 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26.1147h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 12, pp. 1147-1150, IN1-IN2, 1151-1154
Physics
Scientific paper
Riometers on 18 and 30 Mc/s at Rockport, Massachusetts, were used to observe eclipse effects where maximum obscuration at the 100 km level was 97 per cent. Minimum absorption occurred within a few minutes of maximum phase, and the change in absorption compared to the no-eclipse level at this time was 0·65 dB on 18 Mc/s. No positive effects were seen on 30 Mc/s. Total cosmic noise absorption on 18 Mc/s at time of first contact is deduced to be about 1·17 ± 0·29 dB, with most of it occurring in the D-region. Absorption changes due to the eclipse became noticeable within 15 min after first contact. By assuming that " quasi-equilibrium" conditions obtained throughout the eclipse period, it is possible to express the change in absorption as a function of the fraction of unobscured solar disc. The results indicate that quasi-equilibrium did, in fact, exist. Evidence is presented to support the contention that D-region ionization can be attributed in part to localized sources of Ly[alpha] and X-radiation on the solar disc.
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