Patchy occurrence of VHF scintillations at tropical latitudes

Details Patchy occurrence of VHF scintillations at tropical latitudes Patchy occurrence of VHF scintillations at tropical latitudes

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..963m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 7-8, July-Aug. 1992, p. 963-965, 967, 968.

Physics

1

Ionospheric Propagation, Scintillation, Tropical Regions, Very High Frequencies, Annual Variations, Fleet Satellite Communication System, Night, Solar Activity Effects

Scientific paper

Scintillation monitoring by satellite at 244 MHz is employed to study nocturnal patch occurrence at an anomaly crest latitude during different seasons and levels of solar activity. The amplitude scintillations were recorded during 1987-1989, a period in which the mean sunspot number grew from 32 to 154. Patch occurrence is described with a month-to-month histogram of variability, and patches per night increase with sunspot number. A general increase in patches per night is noted in winter and equinox periods with increases in sunspot number. These increases are shown to be consistent with observations by DasGupta et al. (1983) and with the mechanism of patch generation set forth by Abdu et al. (1983). The behavior of the summer events suggests that summer scintillations are not of equatorial origin.

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