On the horizontal distribution of the equatorial thermospheric midnight temperature maximum and its seasonal variation

Details On the horizontal distribution of the equatorial thermospheric midnight temperature maximum and its seasonal variation On the horizontal distribution of the equatorial thermospheric midnight temperature maximum and its seasonal variation

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9.1179h&link_type=abstract

Geophysical Research Letters, vol. 9, Oct. 1982, p. 1179-1182.

Physics

46

Annual Variations, Atmospheric Temperature, Equatorial Atmosphere, Thermosphere, Explorer 55 Satellite, Latitude, Temperature Distribution, Thermal Mapping

Scientific paper

The temperature measurements taken with the NATE experiment on the Atmosphere Explorer-E satellite during 1977 and 1978 are used to obtain the horizontal two-dimensional distribution of the thermospheric nighttime temperature maximum between latitudes 19.8 deg. south and 19.8 deg. north in the altitude range from 250 to about 370 km. The data are used to generate temperature maps for the four seasons. The maps show that the nighttime temperature maximum often occurs first at the geographic equator, and shows a tendency to be largest there. A seasonal rotation of the distribution of the maximum is observed in which the maximum occurs in the summer hemisphere before it occurs in winter. The summer maximum is significantly larger than the winter maximum. The local time of occurrence of the maximum in either hemisphere shows an annual oscillation about local midnight with an amplitude of about 3 hours. The observations indicate that the nighttime temperature oscillates with higher frequencies and amplitudes in the summer hemisphere, thus suggesting that the semidiurnal and higher order tidal modes are stronger in that hemisphere.

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