Three solar cycles of day-time southern hemisphere Es activity

Details Three solar cycles of day-time southern hemisphere Es activity Three solar cycles of day-time southern hemisphere Es activity

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..207b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, March 1984, p. 207-210.

Physics

4

Diurnal Variations, E Region, Ion Production Rates, Solar Cycles, Southern Hemisphere, Annual Variations, Daytime, Solar Terrestrial Interactions, Sunspot Cycle

Scientific paper

The occurrence probabilities over three sun spot cycles (1947-1982) of monthly values for sporadic-E (Es) recorded at two southern hemisphere ionosonde stations, Christchurch in the temperate zone and Rarotonga in the subtropical zone, were reported. It was assumed that the top penetration frequency exceeded ordinary wave top penetration frequency (foEs) by half the electron gyrofrequency, and the blanketing frequency (fbEs) was also considered. Similar results at both stations included the following: the seasonal behavior of the occurrence of hourly values of foEs greater than or equal to 5 MHz and fbEs greater than or equal to 4 MHz, P(fbEs), were independent of the solar cycle phase; a high in-phase correlation existed between P(fbEs) and the Zurich sunspot number at all seasons; and a decrease in foEs occurrence by a factor of approximately three persisted throughout the observation period. Data also demonstrated a six year period in seasonal foEs activity for Rarotonga.

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