Observations of plasma depletions in 557.7-nm images over Kavalur

An all sky imaging system was operated at Kavalur (12.56°N, 78.8°E, 4.6°N, geomagnetic), India, during February‐April 2002. We observed plasma depletions in the 557.7‐ and 630.0‐nm images in several nights and found that in most of the nights, the 557.7‐nm depletions appeared around midnight and bec...

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Bibliographic Details
Published in:Journal of Geophysical Research - Space Physics 2007-07, Vol.112 (A7), p.A07307-n/a
Main Authors: Rajesh, P. K., Liu, J. Y., Sinha, H. S. S., Banerjee, S. B., Misra, R. N., Dutt, N., Dadhania, M. B.
Format: Article
Language:English
Subjects:
airglow
Earth sciences
Earth, ocean, space
Equatorial ionosphere
Exact sciences and technology
Ion chemistry and composition
Ionosphere
Ionosphere/atmosphere interactions
Ionospheric dynamics
Ionospheric irregularities
mesospheric and thermospheric
Plasma depletions
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Summary:An all sky imaging system was operated at Kavalur (12.56°N, 78.8°E, 4.6°N, geomagnetic), India, during February‐April 2002. We observed plasma depletions in the 557.7‐ and 630.0‐nm images in several nights and found that in most of the nights, the 557.7‐nm depletions appeared around midnight and became very pronounced in the postmidnight hours. A simulation is carried out to understand the important physical parameters that influence the emissions of the 557.7 nm in various local times and solar activities, and that result in the appearance of depletions in the integrated images.
ISSN:0148-0227
2156-2202
DOI:10.1029/2006JA012055