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Browsing by Subject "F region"

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Direct detection of wavelike spatial structure at the bottom of the F region and its role on the formation of equatorial plasma bubble

Patra, A. K.; Taori, A.; Chaitanya, P. P.; Sripathi, S. (2013)

We present hitherto unrevealed wavelike spatial structures, as seen in the 630 nm airglow intensity using a scanning photometer, prior to the occurrence of equatorial plasma bubble (EPB). The dominant wavelengths in the ...
Disturbance dynamo effects over low-latitude F region: A study by network of VHF spaced receivers

Kakad, Amar; Surve, G.; Tiwari, P.; Yadav, Virendra; Bhattacharyya, A. (2017)

Generation of equatorial spread F (ESF) irregularities resulting from magnetic disturbance is known for past few decades. However, better prediction models for this phenomenon are still lacking. Magnetic storms also ...
Dynamics of equatorial F region irregularities from spaced receiver scintillation observations

Bhattacharyya, A.; Basu, S.; Groves, K.M.; Valladares, C.E.; Sheehan, R. (2001)

Spaced receiver observations of amplitude scintillations on a 244 MHz signal, at an equatorial station, have been used to study random temporal changes associated with the scintillation-producing irregularities and the ...
Observations of 2–4 day inertia-gravity waves from the equatorial troposphere to the F region during the sudden stratospheric warming event of 2009

Sathishkumar, S.; Sridharan, S. (2011)

We have observed strong 2–4 day wave activity in the F region peak critical frequency (foF2) at 7.5°N obtained from GPS radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere, and ...
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

Parihar, Navin; Padincharapad, Saranya; Singh, Anand Kumar; Mahavarkar, Prasanna; Dimri, Ashok Priyadarshan (2024)

We report F-region airglow imaging of fossil plasma depletions around midnight that revived afresh un der persisting thermospheric gravity wave (GW) activity. An all-sky imager recorded these events in OI 630 nm imag ing ...
Study of irregularities and dynamics of the low latitude ionosphere

Kakad, Bharati Amar (IIG, 2007)

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