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- Title
RADIO FADE-OUTS AND SOLAR ERUPTIONS.
- Authors
Richardson, R. S.
- Abstract
The article presents information on the occurrence of radio fade-outs and solar eruptions. In October, 1935, J. H. Dellinger of the National Bureau of Standards described several sudden and remarkable fade-outs of high-frequency radio transmission, affecting the daylight side of the earth and lasting for about fifteen minutes each. He suggested that these radio disturbances might be connected with solar eruptions. An examination of photographs showing the distribution of hydrogen and calcium in the sun's atmosphere, showed that on three occasions bright chromospheric eruptions had been photographed within a few minutes of the radio fade-outs. On October 10, 1935 the U.S. National Bureau of Standards noted a general improvement in radio transmission on the higher frequencies, which continued until October 21 to 23, when the upper limit of frequency reached the highest value, the investigators had ever observed. The interval between exposures is ordinarily about four minutes, while the actual time required for the image to pass across the slit and thus complete the exposure is about fifty seconds. The radiation producing the fade-outs seems undoubtedly to come from the outbursts that show conspicuously on hydrogen and calcium spectroheliograms. A natural assumption would be that a small area on the sun, at exceptionally high temperature, emits a great amount of black- body radiation of high frequency taken at the same time.
- Subjects
UNITED States; SOLAR radiation; STELLAR activity; DELLINGER, J. H.; RADIO transmitters &; transmission; PHOTOGRAPHS; SOLAR chromosphere; PHOTOGRAPHIC exposure; UNITED States. National Bureau of Standards
- Publication
Science Education, 1937, Vol 21, Issue 4, p193
- ISSN
0036-8326
- Publication type
Article
- DOI
10.1002/sce.3730210406