Computer Science – Sound
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..121r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, Feb.-Mar. 1983, p. 121-125. Research supported by the
Computer Science
Sound
3
Galactic Radiation, Ionosondes, Ionospheric Propagation, Very Low Frequencies, X Ray Sources, Ariel 5 Satellite, Atmospheric Sounding, Diurnal Variations, Stellar Flares
Scientific paper
The galactic X-ray source Cen X-4 produced a large outburst in May 1979, measured by the Ariel-5 satellite. Low ionosphere group heights measured daily by a VLF ionosonde indicated an anomalous lowering of the effective reflection height in good correlation with the Cen X-4 burst as well as an increase in the reflection coefficient, larger for frequencies. Diurnal VLF phase variations in a long-distance propagation path presented night-time 3-4 standard deviations from the average in some days during the Cen X-4 bursting period. The geomagnetic activity in the period covered by this investigation was low, and the results obtained are a suggested confirmation that galactic transient X-ray sources are c apable of producing sufficient ionization effects to be detected as low ionosphere anomalies.
Kaufmann Patrik
Ramirez Pardo P.
Rizzo Piazza Liliana
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