Highly localized cooling in daytime mesopause temperature over the dip equator during counter electrojet events: First results

Details Highly localized cooling in daytime mesopause temperature over the dip equator during counter electrojet events: First results Highly localized cooling in daytime mesopause temperature over the dip equator during counter electrojet events: First results

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414101v&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 14, CiteID L14101

Physics

9

Ionosphere: Equatorial Ionosphere, Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Atmospheric Processes: Mesospheric Dynamics, Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Ionosphere/Atmosphere Interactions (0335)

Scientific paper

The first observations of lowering of mesopause temperature during Counter Electrojet (CEJ) events over a narrow region of ~ +/-150 km centered at around magnetic equator are presented. The daytime mesopause temperature is measured over Trivandrum (8.5°N 77°E dip lat. 0.5°N), India using the ground based Multiwavelength Dayglow Photometer. The unique meridional scanning capability of the instrument is extensively used in this study. A lowering of temperature by as much as ~25 K has been observed during certain CEJ events, which includes a few partial CEJs. The gravity wave tidal interaction through vertically upward wind is proposed to be manifesting as lowering in the mesopause temperature and also as CEJ. These observations are `new' and address to the issues concerning the vertical coupling processes prevailing in the equatorial Mesosphere Lower Thermosphere Ionosphere (MLTI) region.

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