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Highly localized cooling in daytime mesopause temperature over the dip equator during counter electrojet events: First results
Author(s) -
Vineeth C.,
Pant Tarun Kumar,
Devasia C. V.,
Sridharan R.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030298
Subject(s) - mesopause , thermosphere , electrojet , daytime , atmospheric sciences , mesosphere , equator , zonal and meridional , equatorial electrojet , magnetic dip , ionosphere , atmospheric tide , morning , photometer , geology , environmental science , geophysics , geodesy , physics , earth's magnetic field , stratosphere , latitude , optics , astronomy , magnetic field , quantum mechanics
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.