Observations of the two level mesospause and O2 airglow distributions by using HRDI data in 1992-1998

Details Observations of the two level mesospause and O2 airglow distributions by using HRDI data in 1992-1998 Observations of the two level mesospause and O2 airglow distributions by using HRDI data in 1992-1998

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52a08n&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA52A-08

Physics

0310 Airglow And Aurora, 0340 Middle Atmosphere--Composition And Chemistry

Scientific paper

HRDI on board the Upper Atmospheric Research Satellite (UARS) are used to investigate the temperatures and airglow in terms global and long-term variations in the mesopause region. Data spread over seven years (1992-1998) in the height region of 75-105 km show a two level mesopause structure. The high level mesopause with temperature of 180-190 K and low level mesopause with temperature of 140-150K observed for summer and winter. In the equinoxes, a single level mesopause is seen around 98 km altitude in both the hemispheres. The annually averaged temperature data shows 5K warming of high level mesopause during 1992 and 1993. The time series analysis of temperature at 99 km shows a decrease of -1.2 K/yr over the equatorial region during 1992-1998. The O2 A-band airglow data found a strong latitudinal dependence symmetrical about the equator. The tropical volume emission rate data revealed a high values in spring and fall than in the summer and winter. However, opposite trend was found in 1998. Long term variation was found, and attributions to instrumental or geophysical problems are discussed.

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