Physics – Space Physics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ijrsp...3..337d&link_type=abstract
Indian Journal of Radio and Space Physics, vol. 3, Dec. 1974, p. 337-340.
Physics
Space Physics
Solar Activity Effects, Solar X-Rays, Sudden Ionospheric Disturbances, Diurnal Variations, Graphs (Charts), Infrared Radiation, Solar Flares, Solar Flux, Solar Radio Emission, Solar Spectra, Tables (Data)
Scientific paper
Solar X-ray flares and associated sudden ionospheric disturbances (SIDs) are examined with respect to the level of solar 1-8 A activity. A period of increasing solar activity from January 1966 to December 1969 has been considered. It is found that the occurrence of SIDs depends on the level of 1-8 A activity, as also on the way in which it builds up. The threshold 1-8 A flux for an X-ray flare to produce an SID effect increases with the level of solar activity. Peak 1-8 A flux during X-ray flares increases with the level of solar activity, and in the case of flares producing SIDs, it is on the average 4-5 times larger than for flares without associated SIDs.
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