Observations of Plasma Depletions in 557.7, 630.0, and 777.4 nm All Sky Images in Solar Maximum

Details Observations of Plasma Depletions in 557.7, 630.0, and 777.4 nm All Sky Images in Solar Maximum Observations of Plasma Depletions in 557.7, 630.0, and 777.4 nm All Sky Images in Solar Maximum

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa24a..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA24A-02

Physics

2415 Equatorial Ionosphere, 2419 Ion Chemistry And Composition (0335), 2423 Ionization Processes (7823), 2427 Ionosphere/Atmosphere Interactions (0335), 2439 Ionospheric Irregularities

Scientific paper

The observations of plasma depletions in the 557.7, 630.0 and 777.4 nm all sky images at the low-latitude station Kavalur (12.5°N, 78.8°E, 4.6°N, geomagnetic), India, during February- March in 2002 are reported in this work. It is shown using simulations that the post-midnight peak in the observed occurrence of depletions in 557.7 nm is due to the less effective masking of its thermospheric component by the mesospheric component in solar maximum. The variation of the strength of this masking with solar activity is discussed. The sequence of images showing the development of post-midnight depletions in 630.0 nm are presented. The total electron content (TEC) phase flucutations (Fp) derived from co-located Global Positioning System (GPS) receiver and the F-layer base height (h'F) variation recorded at the equatorial station Trivandrum (7.6 °N, 76.9°E, 1.2°S, geomagnetic) are used to understand the irregularity features. The appearance of depletions in 630.0 nm in the post-sunset period as dark pathces entering from the northern end of the field-of-view (FOV) and gradually growing equatorwards, in contrast to the dark bands extending throughout the FOV along the N-S direction in the almost simultaneously taken 777.4 nm images are illustrated and discussed.

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