Seasonal variations of the mesopause temperature observed at equatorial (4°S) and low (23°S) latitude stations

Details Seasonal variations of the mesopause temperature observed at equatorial (4°S) and low (23°S) latitude stations Seasonal variations of the mesopause temperature observed at equatorial (4°S) and low (23°S) latitude stations

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14...97t&link_type=abstract

Advances in Space Research, Volume 14, Issue 9, p. 97-100.

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6

Scientific paper

Upper mesospheric temperatures at around 87km have been observed by measuring the rotational temperature of the airglow OH(9,4) band emission at two ground-based locations, one in the equatorial region, Fortaleza (3.9°S, 38.4°W) and the other at low latitude, Cachoeira Paulista (22.7°S, 45.0°W). The data obtained from 1987 to 1991, which includes the DYANA Campaign period, show predominantly semi-annual oscillations at both the locations with maxima at the equinoxes and minima during solistices. The seasonal variation in the equatorial region is, however, much larger (18K peak to peak) than at low latitudes, where it is around 8K, peak to peak. These results agree fairly well with the SME satellite data, but do not agree with model atmospheres presently available. It is suggested that the seasonal effect in vertical turbulent mixing is stronger in the equatorial region than at low to middle latitudes.

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