Other
Scientific paper
Aug 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970p%26ss...18.1225e&link_type=abstract
Planetary and Space Science, Volume 18, Issue 8, p. 1225-1253.
Other
1
Scientific paper
F-region electron densities, electron and ion temperatures observed during the year 1965 at the Millstone Hill radar observatory (42.6°N, 71.5°W) by the UHF Thomson (incoherent) scatter radar are presented. The measurements were made over 48-hr periods that were usually scheduled to include the International Geophysical World days near the center of each month. Most measurements were made during magnetically quiet periods, and are thought to be representative of the behavior expected on the rising part of the sunspot cycle. It is shown that Millstone is a midlatitude station exhibiting a characteristic `winter' and `summer' daytime density variation, and that the transition between these two types occurs rapidly around equinox without any corresponding seasonal change in the F-region thermal structure. Current ideas concerning the mechanisms responsible for this and other features of diurnal and seasonal variations are discussed. It is proposed that photoelectron escape leading to heat deposition in the protonosphere serves to equalize the plasma temperatures in conjugate ionospheres. As a result there is little seasonal variation in electron or ion temperature and magnetic control of the topside electron densities is established.
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