Computer Science – Sound
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..281r&link_type=abstract
Annales Geophysicae (ISSN 0980-8752), vol. 7, June 1989, p. 281-284.
Computer Science
Sound
6
Ionospheric Sounding, Radio Transmission, Scintillation, Spread F, Equatorial Atmosphere, Histograms, Ionization
Scientific paper
The paper compares the scintillations of VHF radio waves at a tropical latitude station with the spread-F records at a nearby ionospheric sounding station. The scintillations are very strong (amplitude exceeding 10 dB peak to peak) and fast during the periods when the spread-F is characterized by a series of discrete multiple layers parallel to the first order (p-prime)-f trace over the entire frequency range. The scintillations become slow and weak when spread-F is characterized by overlapping series of (p-prime)-f curves on frequencies close to the critical frequency which occur generally during the postmidnight hours, when the ambient ionization is low. On a number of occasions, scintillations are observed in patches with brief periods of no scintillation activity. This patchy nature of scintillations closely corresponds with the pattern of spread-F appearance and disappearance for brief periods at Ahmedabad.
Chandra Harish
Koparkar P. V.
Rastogi R. G.
Vyas G. D.
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