Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2569t&link_type=abstract
Journal of Geophysical Research, vol. 87, Apr. 1, 1982, p. 2569, 2570. Research supported by the Middle East Technical Universi
Physics
5
Atmospheric Radiation, Electromagnetic Pulses, Light Emission, Solar Activity Effects, Annual Variations, Cerenkov Radiation, Ecliptic, Night Sky, Photomultiplier Tubes, Sunspots, Zenith
Scientific paper
A study is made of the millisecond time scale diffuse atmospheric light emissions showing 10-kHz damped oscillations between June 12, 1972, and April 1, 1976. A wide-angle photomultiplier system is used. New evidence is found relating these light pulses to solar activity. The nonuniform seasonal variations are considered an interesting feature of the FAP (fast atmospheric pulsations) events. The increase in the rate of these events during the autumn and winter seasons demonstrates that their frequency of occurrence increases significantly when the zenith direction at the experimental station approaches closest to the ecliptic plane. It is thought that the new evidence found for the solar activity dependence of the FAP events will probably lead to new experiments designed primarily to detect these events.
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