Search Results - "DEVASIA, C. V"

Atmosphere-Ionosphere coupling observed over the dip equatorial MLTI region through the quasi 16-day wave by Vineeth, C., Pant, Tarun Kumar, Devasia, C. V., Sridharan, R.

“…The present paper analyses the variations of daytime mesopause temperature and the Equatorial electrojet strength over the dip equator during December…”
Get full text

Response of the equatorial and low-latitude ionosphere in the Indian sector to the geomagnetic storms of January 2005 by Sreeja, V., Devasia, C. V., Ravindran, Sudha, Pant, Tarun Kumar, Sridharan, R.

“…The equatorial and low‐latitude ionospheric response to three moderate geomagnetic storms (17, 18, and 22 January) during the period from 16 to 23 January 2005…”
Get full text

Equatorial and low-latitude ionosphere-thermosphere system response to the space weather event of August 2005 by Sreeja, V., Ravindran, Sudha, Pant, Tarun Kumar, Devasia, C. V., Paxton, L. J.

“…The response of the equatorial and low‐latitude ionosphere‐thermosphere system to the geomagnetic storm during 23–26 August 2005 is investigated. The study is…”
Get full text

On the seasonal variations of the threshold height for the occurrence of equatorial spread F during solar minimum and maximum years by MANJU, G, DEVASIA, C. V, SRIDHARAN, R

“…A study has been carried out on the occurrence of bottom side equatorial spread F (ESF) and its dependence on the polarity and magnitude of the thermospheric…”
Get full text

Highly localized cooling in daytime mesopause temperature over the dip equator during counter electrojet events: First results by Vineeth, C., Pant, Tarun Kumar, Devasia, C. V., Sridharan, R.

“…The first observations of lowering of mesopause temperature during Counter Electrojet (CEJ) events over a narrow region of ∼ ±150 km centered at around…”
Get full text

Electrodynamical response of the Indian low-mid latitude ionosphere to the very large solar flare of 28 October 2003 ― a case study by MANJU, G, PANT, T. K, DEVASIA, C. V, RAVINDRAN, S, SRIDHARAN, R

“…The electrodynamic effects on the low-mid latitude ionospheric region have been investigated using GPS (global positioning system) data, ionosonde data and ΔH…”
Get full text

Observational evidence for the plausible linkage of Equatorial Electrojet (EEJ) electric field variations with the post sunset F-region electrodynamics by SREEJA, V, DEVASIA, C. V, RAVINDRAN, Sudha, TARUN KUMAR PANT

“…The paper is based on a detailed observational study of the Equatorial Spread F (ESF) events on geomagnetically quiet (Ap≤20) days of the solar maximum (2001),…”
Get full text

Deterministic prediction of post-sunset ESF based on the strength and asymmetry of EIA from ground based TEC measurements: Preliminary results by Thampi, Smitha V., Ravindran, Sudha, Pant, Tarun Kumar, Devasia, C. V., Sreelatha, P., Sridharan, R.

“…This paper provides the first observations of EIA asymmetry by receiving beacon transmissions onboard low earth orbiting satellites from a single station…”
Get full text

Effects of interplanetary electric field on the development of an equatorial spread F event by Chakrabarty, D., Sekar, R., Narayanan, R., Patra, A. K., Devasia, C. V.

“…On a geomagnetically disturbed night (7 January 2005), an equatorial spread F (ESF) event was captured during premidnight hours by the Indian MST radar…”
Get full text

The role of post-sunset vertical drifts at the equator in predicting the onset of VHF scintillations during high and low sunspot activity years by TULASI RAM, S, RAMA RAO, P. V. S, NIRANJAN, K, PRASAD, D. S. V. V. D, SRIDHARAN, R, DEVASIA, C. V, RAVINDRAN, Sudha

“…The day-to-day variability in the occurrence of ionospheric scintillations, which are of serious concern in the trans-ionospheric communications, makes their…”
Get full text

Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements by SEKAR, R, CHAKRABARTY, D, SARKHEL, S, PATRA, A. K, DEVASIA, C. V, KELLEY, M. C

“…Plasma irregularity structures associated with an Equatorial Spread-F (ESF) event were recorded by the Indian VHF Radar on 26–27 April 2006 near midnight…”
Get full text

The persistence of equatorial spread F -an analysis on seasonal, solar activity and geomagnetic activity aspects by SREEJA, V, DEVASIA, C. V, RAVINDRAN, Sudha, SRIDHARAN, R

“…The persistence (duration) of Equatorial Spread F (ESF), which has significant impact on communication systems, is addressed. Its behavior during different…”
Get full text

Threshold height (h′F)c for the meridional wind to play a deterministic role in the bottom side equatorial spread F and its dependence on solar activity by Jyoti, N., Devasia, C. V., Sridharan, R., Tiwari, Diwakar

“…Detailed investigations have been carried out on the occurrence of bottom side Equatorial Spread F (ESF) and the thermospheric meridional wind characteristics…”
Get full text

Ionospheric storm of early November 1993 in the Indian equatorial region by Sastri, J. Hanumath, Jyoti, N., Somayajulu, V. V., Chandra, H., Devasia, C. V.

“…An investigation is made of the response of equatorial ionosphere in the Indian (75°E) sector to the major magnetic storm of November 3, 1993, using data from…”
Get full text

Electrodynamics of the equatorial F-region ionosphere during pre-sunrise period by PRABHAKARAN NAYAR, S. R, MATHEW, T. J, SREEHARI, C. V, SUMOD, S. G, DEVASIA, C. V, RAVINDRAN, S, SREEJA, V, KUMAR PANT, T, SRIDHARAN, R

“…The electrodynamics of the pre-sunrise equatorial F-region is investigated using HF Doppler radar and digital ionosonde. The observations are limited to those…”
Get full text

Investigation on the mesopause energetics and its possible implications on the equatorial MLTI processes through coordinated daytime airglow and radar measurements by Pant, Tarun Kumar, Tiwari, Diwakar, Vineeth, C., Thampi, Smitha V., Sridharan, S., Devasia, C. V., Sridharan, R., Gurubaran, S., Sekar, R.

“…This paper investigates the simultaneous presence of a prominent planetary scale modulations of quasi 16‐day period observed in the daytime mean mesopause…”
Get full text

An additional layer in the low-latitude ionosphere in Indian longitudes: Total electron content observations and modeling by Thampi, Smitha V., Balan, N., Ravindran, Sudha, Pant, Tarun Kumar, Devasia, C. V., Sreelatha, P., Sridharan, R., Bailey, G. J.

“…The paper presents the observations and modeling of an additional layer in the low‐latitude ionosphere in Indian longitudes. The signatures of the additional…”
Get full text

A comparative study of daytime mesopause temperatures obtained using unique ground based optical and meteor wind radar techniques over the magnetic equator by Vineeth, C., Pant, Tarun Kumar, Antonita, Maria, Ramkumar, Geetha, Devasia, C. V., Sridharan, R.

“…This paper presents the first ever comparison of daytime Mesopause OH rotational temperatures as determined using Meinel (8‐3) dayglow emissions with those…”
Get full text

Seasonal dependence of the forecast parameter based on the EIA characteristics for the prediction of Equatorial Spread F (ESF) by THAMPI, S. V, RAVINDRAN, S, PANT, T. K, DEVASIA, C. V, SRIDHARAN, R

“…In an earlier study, Thampi et al. (2006) have shown that the strength and asymmetry of Equatorial Ionization Anomaly (EIA), obtained well ahead of the onset…”
Get full text

The seasonal and solar cycle variations of electron density gradient scale length, vertical drift and layer height during magnetically quiet days: Implications for Spread F over Trivandrum, India by Manju, G., Devasia, C. V., Ravindran, Sudha

“…A study has been carried out on the behaviour of electron density gradient scale length, L , vertical drift and layer height, around post sunset hours, during…”
Get full text