Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5792f&link_type=abstract
Journal of Geophysical Research, vol. 84, Oct. 1, 1979, p. 5792-5796.
Physics
41
Annual Variations, F Region, Ionospheric Drift, Magnetic Equator, Solar Activity Effects, Solar Cycles, Drift Rate, Dynamo Theory, E Region, Electric Fields, Electron Density Profiles
Scientific paper
The results of vertical drift measurements made at Jicamarca for more than half a solar cycle are examined, noting that the data from periods of high and low activity are appreciably different. It is found that daytime drift velocities during sunspot minimum are usually larger than during the maximum, while the opposite is true for nighttime periods. It is shown that by integrating the drift velocity data with respect to time, a measure of the total potential drop between the reversal points (near the terminators) can be obtained. It is concluded that the general features of the data cannot be explained solely on the basis of tidal winds driving an E region dynamo; polarization fields related to the F region dynamo are of importance, particularly in helping to explain the enhancement of the daytime upward drift which often occurs shortly before the drift reverses to downward in the evening.
Calderón Carolina
Farley Donald T.
Fejer B. F.
Woodman Ronald F.
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