Physics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28..407a&link_type=abstract
Planetary and Space Science, vol. 28, Apr. 1980, p. 407-417.
Physics
2
Ionospheric Drift, Ionospheric Propagation, Nocturnal Variations, Plasmasphere, Whistlers, Data Processing, Doppler Effect, E Region, F Region, Magnetosphere-Ionosphere Coupling, Very Low Frequencies, Winter
Scientific paper
A method recently reported for measuring radial drifts in the equatorial plane and ionosphere-magnetosphere coupling fluxes from Doppler shifts and group delays on whistler mode signals is applied to VLF transmissions from station NLK 18.6 kHz. Data from 22 nights, primarily during November to February, are analyzed. It is found that fluxes generally contribute less than 20% to the measured Doppler shift, most of which is therefore produced by cross-L drifts. Doppler shift data previously accumulated over a number of years and relating to signals in ducts near L = 2.3 are reexamined. Dominating the nightly behavior is an inward drift which reaches a maximum of about 100 m/s as the duct ends cross the dusk terminator, and an outward drift at dawn of the same magnitude which is initiated when the duct end crosses the terminator in the E or lower-F region.
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