Articles | Volume 42, issue 1
https://doi.org/10.5194/angeo-42-131-2024
https://doi.org/10.5194/angeo-42-131-2024
Regular paper
 | 
07 May 2024
Regular paper |  | 07 May 2024

Simultaneous OI 630 nm imaging observations of thermospheric gravity waves and associated revival of fossil depletions around midnight near the equatorial ionization anomaly (EIA) crest

Navin Parihar, Saranya Padincharapad, Anand Kumar Singh, Prasanna Mahavarkar, and Ashok Priyadarshan Dimri

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Cited articles

Abdu, M. A., Alam Kherani, E., Batista, I. S., de Paula, E. R., Fritts, D. C., and Sobral, J. H. A.: Gravity wave initiation of equatorial spread F/plasma bubble irregularities based on observational data from the SpreadFEx campaign, Ann. Geophys., 27, 2607–2622, https://doi.org/10.5194/angeo-27-2607-2009, 2009. a
Abdu, M. A., Iyer, K. N., de Medeiros, R., Batista, I. S., and Sobral, J. H.: Thermospheric meridional wind control of equatorial spread F and evening prereversal electric field, Geophys. Res. Lett., 33, L07106, https://doi.org/10.1029/2005GL024835, 2006. a
Azeem, I. and Barlage, M.: Atmosphere-ionosphere coupling from convectively generated gravity waves, Adv. Space Res., 61, 1931–1941, https://doi.org/10.1016/j.asr.2017.09.029, 2018. a
Chapagain, N. P., Taylor, M. J., and Eccles, J. V.: Airglow observations and modeling of F region depletion zonal velocities over Christmas Island, J. Geophys. Res.-Space, 116, A02301, https://doi.org/10.1029/2010JA015958, 2011. a
Ciraolo, L., Azpilicueta, F., Brunini, C., Meza, A., and Radicella, S. M.: Calibration errors on experimental slant total electron content (TEC) determined with GPS, J. Geodesy, 81, 111–120, https://doi.org/10.1007/s00190-006-0093-1, 2007 (data available at: https://t-ict4d.ictp.it/nequick2/gnss-tec-calibration, last access: 1 May 2024). a
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Short summary
Gravity waves are well known for deforming the bottom-side plasma of the F region into the wavelike ionization structures which then act as a seed for Rayleigh–Taylor instability, which in turn generates irregularities. The present study features midnight fossil airglow depletions that revived due to ongoing gravity wave (GW) activity and turned into an active depletion.
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