Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..42...57k&link_type=abstract
(COSPAR, Symposium on Fast Transients in X- and Gamma-Rays, Varna, Bulgaria, May 29-31, 1975.) Astrophysics and Space Science, v
Astronomy and Astrophysics
Astrophysics
4
Cosmic X Rays, Gamma Rays, Ionospheric Propagation, Very Low Frequencies, X Ray Sources, D Region, Field Strength, Novae, Particle Production, Satellite Observation, X Ray Stars
Scientific paper
The paper presents the results of investigations of the ionospheric effects arising from transient celestial events at X-ray and gamma-ray energies, such as those from X-ray novae and cosmic gamma-ray bursts. The VLF data recorded at Ahmedabad corresponding to the 164 kHz transmission from Tashkent are examined to see whether there are any observable effects time coincident with the transit of the X-ray novae Cen X-4 and Cet X-2 around their intensity maxima. In addition, the VLF data have been examined in relation to the cosmic gamma-ray bursts detected by Vela, IMP-6 and OSO-7 satellites. Theoretical computations are carried out for estimating electron density enhancements using the available data on intensities and energy spectra for these events. The observational results are explained in terms of these theoretical calculations.
Chakravarty S. C.
Kasturirangan K.
Rao U. R.
Rastogi R. G.
Sharma Darma P.
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