Physics
Scientific paper
Apr 1953
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953natur.171..692p&link_type=abstract
Nature, Volume 171, Issue 4355, pp. 692-693 (1953).
Physics
1
Scientific paper
IF the distributions of electron density and temperature in the sun's atmosphere are known, thermal emission at any frequency in the radio spectrum may be calculated. Conversely, properties of the atmosphere may be deduced from the observed thermal emission spectrum1. In the range above 600 Mc./s. the observed level of radiation can be correlated with visible sunspot area. Excess radiation appearing with spots has been interpreted2 as thermal emission from very hot (107° K. or more) high-pressure (perhaps a hundred times that of surrounding regions) regions above the sunspots. There is optical evidence3 of similar regions, and the good agreement between theory and radio observations lends weight to the suggestion.
Davies Rhodri D.
Piddington J. H.
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