Use of Interplanetary Radio Scintillation Power Spectra in Predicting Geomagnetic Disturbances.
Final rept. Jun 76-Sep 77,
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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An investigation of the feasibility of using interplanetary scintillations IPS of cosmic radio sources for prediction of geomagnetic disturbances has been carried out based on observations taken May-December 1974 and May-August 1976. The 1974 observations were taken with the University of Iowa COCOA-Cross array at 34.3 MHz located at Clark Lake Radio Observatory near Borrego Springs, California and synoptic data on 33 sources were reduced to yield scintillation index band-pass integrated IPS power for each source. In 1976, COCOA-Cross observations at 34.3 MHz were supplemented by 38 MHz observations from the University of Maryland TPT array, also at Clark Lake, and the high time resolution data were reduced to obtain IPS power spectra from 0.1 to 3 Hz. From detailed analyses of both data sets, we conclude that IPS prediction of the onset of geomagnetic disturbances may be feasible with a lead time of about one day. Author