Physics – Space Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ijrsp...8..418s&link_type=abstract
(National Physical Laboratory of India, Indian Space Research Organization, and Indian National Science Academy, Annual Radio an
Physics
Space Physics
Ionospheric Propagation, Radio Attenuation, Solar Flares, Sudden Ionospheric Disturbances, High Frequencies, Low Frequencies, Magnetic Field Configurations, Solar Activity Effects, Solar X-Rays
Scientific paper
Sudden ionospheric disturbances (SID) observed in LF and HF bands
exhibit the long-duration absorption of a signal (LAS) superimposed on
the main effect. The LAS starts earlier than the main effect as a
precursor and may serve to predict such SID events. A connection of the
precursor with flare X-rays in 1-8 and 8-20-A wavelengths is shown.
Saha Bijan
Sehra J. S.
Sen Asok Kumar
Trehan S. K.
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