Thermal structure of the mesopause at 18°~N

Details Thermal structure of the mesopause at 18°~N Thermal structure of the mesopause at 18°~N

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa52a..09f&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA52A-09

Physics

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0335 Ion Chemistry Of The Atmosphere (2419, 2427), 0350 Pressure, Density, And Temperature, 0394 Instruments And Techniques

Scientific paper

The fact that the earth's mesopause resides at two distict altitudes, depending on season, was established by von Zahn et al.} [1996] and She and von Zahn} [1998]. In particular, there appears to be a strong latitudinal dependence, and von Zahn et al.} [1996] showed: 1. That the low latitude mesopause appears to be always in winter state, and 2. that there is a distinct transition from winter-to-summer state that migrates latitudinally with season. The seasonal climatology of the mesopause region is only being studied at mid-latitude sites at the present time. A low-latitude site making regular mesopause temperature profile measurements is important to increase understanding of the two-level mesopause. The Arecibo Observatory has been operating a potassium resonance temperature lidar since May, 2001. Mesopause temperature profiles have been recorded for May, July, and August. In this paper, we will present the results of these studies, accompanied with airglow measurements of {O} (1{S}), {O}2 (0-1), and the OH (6-2) Meinel bands, as well as ISR measurements of the nighttime E-region. These and continuing observations of the mesopause at 18°~N add a new fixed latitude point for the monitoring of mesopause-region climatology.

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