Characteristics of Plasma Depletions Over Indian Region During Solar Maximum

Details Characteristics of Plasma Depletions Over Indian Region During Solar Maximum Characteristics of Plasma Depletions Over Indian Region During Solar Maximum

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa21a0282r&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA21A-0282

Physics

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 2415 Equatorial Ionosphere, 2419 Ion Chemistry And Composition (0335), 2439 Ionospheric Irregularities

Scientific paper

The all sky imaging observations from Kavalur (12.56° N, 78.8° E), India during February-April in 2002 showed the occurrence of plasma depletions in several consecutive nights. Depletions were present in 630.0 and 777.4 nm for about 80% of the total nights of observation. Out of this, about 70% of the nights showed depletions in 557.7 nm also. There was no significant geomagentic activity during the period. The h'F variation obtained from Trivandrum (7.6 °N, 76.9°E) showed rapid upward motion of F-layer in the post-sunset hours, with vertical velocity in the range 30-70 m/s, and an average value of 41 m/s. About 37% of the nights of depletions in 630.0 nm showed the midnight/post- midnight generation of irregularities within the field of view. In contrast to 630.0 and 777.4 nm, depletions were seen in 557.7 nm around midnight or in the post-midnight hours. Simulations confirm that during solar maximum the thermsperic component of 557.7 nm emission dominates over its mesospheric counterpart in the post-midnight hours, while in solar minimum, the mesospheric component is higher throughout the night.

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