Computer Science
Scientific paper
Feb 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22..209t&link_type=abstract
Planetary and Space Science, Volume 22, Issue 2, p. 209-222.
Computer Science
1
Scientific paper
Routine measurements of the slab thickness of the ionosphere, from 1965 to 1971, are used to infer the changes in neutral temperature and ion composition at a mean latitude of 40°S. Values of neutral temperature Tn, at solar maximum, are 5-10 per cent above northern hemisphere backscatter results. The diurnal and seasonal changes agree closely with satellite drag and backscatter measurements, except that the maximum temperature occurs after sunset in winter. Winter night-time values of the O+/H+ transition height hT were 500 km in 1965-1966, 800 km in 1968-1969 and 700 km in 1971. Changes in hT lag about 6 months behind the changes in solar flux. Diurnal variations have a minimum just before sunrise and a maximum 1-3 hr after noon. On winter nights hT descends to the level set by chemical equilibrium. On summer nights hT is always above this level, giving a continual production of H+ which serves as an additional source for maintaining the night-time ionosphere in the winter hemisphere.
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