The annual variation in quiet time plasmaspheric electron density, determined from whistler mode group delays

Details The annual variation in quiet time plasmaspheric electron density, determined from whistler mode group delays The annual variation in quiet time plasmaspheric electron density, determined from whistler mode group delays

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1059c&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, July 1991, p. 1059-1067.

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46

Annual Variations, F 2 Region, Ionospheric Electron Density, Plasmasphere, Whistlers, Equatorial Atmosphere, Ionospheric Propagation, Propagation Modes, Solar Activity

Scientific paper

Whistler mode group delays from the VLF Doppler experiment at Faraday, Antarctica (65 degS, 64 degW) show an annual variation that has a maximum in December and a minimum in June/July. Assuming signal propagation at constant L (L = 2.5), this implies an annual equatorial electron density (Neq) variation, with December values 3 times higher than in June (during solar minimum-1986). This annual variation in Neq can be modelled from the combined fF2 medians at each end of the field line by assuming that diffusive equilibrium is maintained from the F2 layer to the equator over long (1 month or longer) time scales during quiet magnetic conditions. The use of this model enables the longitude dependence of the annual Neq variation to be investigated. fF2 data from two other pair of near-conjugate stations at 50 degE and 180 degE suggest that there are probably no other regions where there are such large annual variations in Neq at L = 2.5.

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