GUVI Biblio | guvitimed.jhuapl.edu

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Found 15 entries in the Bibliography.

Showing entries from 1 through 15

2022

The geoeffectiveness of TIE-GCM simulations of ionospheric critical frequency foF2 at the equatorial station of Thiruvananthapuram in the Indian sector

An extensive intercomparison of ionospheric foF2 observations and NCAR Thermosphere-Ionosphere ElectrodynamicsGeneral Circulation Model(TIE-GCM)simulations has been carried out for the dip equatorial location of Thiruvananthapuram. Ionosonde measurements for geomagnetically quiet days of 2002, 2006 and 2008, representing solar maximum, solar minimum and deep solar minimum conditions have been used for the analysis. In general TIE-GCM simulations reproduced the temporal and seasonal characteristics of foF2 over Thiruvananthap ...

Mridula, N.; Manju, G.; Sijikumar, S.; Pant, Tarun;

Published by: Advances in Space Research Published on: may

YEAR: 2022 DOI: 10.1016/j.asr.2022.02.018

Comparison; foF2; TIE-GCM

The geoeffectiveness of TIE-GCM simulations of ionospheric critical frequency foF2 at the equatorial station of Thiruvananthapuram in the Indian sector

Mridula, N.; Manju, G.; Sijikumar, S.; Pant, Tarun;

Published by: Advances in Space Research Published on: may

YEAR: 2022 DOI: 10.1016/j.asr.2022.02.018

Comparison; foF2; TIE-GCM

Signatures of Equatorial Plasma Bubbles and Ionospheric Scintillations from Magnetometer and GNSS Observations in the Indian Longitudes during the Space Weather Events of Early September 2017

Scintillation due to ionospheric plasma irregularities remains a challenging task for the space science community as it can severely threaten the dynamic systems relying on space-based navigation services. In the present paper, we probe the ionospheric current and plasma irregularity characteristics from a latitudinal arrangement of magnetometers and Global Navigation Satellite System (GNSS) stations from the equator to the far low latitude location over the Indian longitudes, during the severe space weather events of 6–10 ...

Vankadara, Ram; Panda, Sampad; Amory-Mazaudier, Christine; Fleury, Rolland; Devanaboyina, Venkata; Pant, Tarun; Jamjareegulgarn, Punyawi; Haq, Mohd; Okoh, Daniel; Seemala, Gopi;

Published by: Remote Sensing Published on: jan

YEAR: 2022 DOI: 10.3390/rs14030652

space weather; equatorial plasma bubbles; ionospheric irregularity; global navigation satellite system; magnetometer; poleward drift; rate of change of TEC index; scintillations; storm-time electric currents

2019

Signatures of Sudden Storm Commencement on the equatorial thermospheric dayglow

It has been observed that the OI 630.0\ nm dayglow emission over a dip equatorial station, Trivandrum (8.5\textdegree\ N, 77\textdegree\ E, dip 0.5\textdegree\ N), India registered an abrupt increase of\ ~\ 2000\ R during the compression phase of the magnetosphere as dictated by a sudden increase in solar wind ram pressure. Furthermore, an unusual depletion of these emissions has been observed during the eastward interplanetary electric field (IEF), concomitant with southward excursion o ...

Sumod, Sukumarn; Pant, Tarun; Ajesh, Asokan;

Published by: Journal of Space Weather and Space Climate Published on: 06/2019

YEAR: 2019 DOI: 10.1051/swsc/2019026

2017

Ionosphere VHF scintillations over Vaddeswaram (Geographic Latitude 16.31\textdegreeN, Geographic Longitude 80.30\textdegreeE, Dip 18\textdegreeN), a latitude Indian station \textendash A case study

This research reports the 250\ MHz amplitude ionosphere scintillations recorded at Vaddeswaram (Geographic Latitude 16.31\textdegreeN, Geographic Longitude 80.30\textdegreeE, Dip 18\textdegreeN), a low-latitude station in India. Though amplitude scintillations were recorded for four continuous days (05\textendash08 November 2011), the presence of intense and long-duration scintillations on 06 November 2011 instigated us to verify the ionosphere background conditions. This research, therefore, is also used important d ...

Brahmanandam, P.S.; Uma, G.; Pant, T.K.;

Published by: Advances in Space Research Published on: 10/2017

YEAR: 2017 DOI: 10.1016/j.asr.2017.06.051

2016

Direct observational evidence for disturbance dynamo on the daytime low-latitude ionosphere: A case study based on the 28 June 2013 space weather event

A case of the westward disturbance dynamo (DD) electric field, influencing the daytime equatorial and low-latitude ionosphere, during a geomagnetic storm that occurred on 28\textendash29 June 2013 is presented. The GPS total electron content (TEC) observations from a network of stations in the Indian equatorial, low and middle latitude regions along with the radio beacon TEC, ionosonde, and magnetic field observations are used to study the storm time behavior of the ionosphere. Negative ionospheric storm effects were seen ...

Thampi, Smitha; Shreedevi, P.; Choudhary, R.; Pant, Tarun; Chakrabarty, D.; Sunda, S.; Mukherjee, S.; Bhardwaj, Anil;

Published by: Journal of Geophysical Research: Space Physics Published on: 09/2016

YEAR: 2016 DOI: 10.1002/2016JA023037

On the latitudinal changes in ionospheric electrodynamics and composition based on observations over the 76-77\textdegreeE meridian from both hemispheres during a geomagnetic storm

The relative contributions of the composition disturbances and the disturbance electric fields in the redistribution of ionospheric plasma is investigated in detail by taking the case of a long-duration positive ionospheric storm that occurred during 18\textendash21 February 2014. GPS total electron content (TEC) data from the Indian Antarctic station, Bharti (69.4\textdegreeS, 76.2\textdegreeE geographic), the northern midlatitude station Hanle (32.8\textdegreeN, 78.9\textdegreeE geographic), northern low-latitude statio ...

Shreedevi, P.; Thampi, Smitha; Chakrabarty, D.; Choudhary, R.; Pant, Tarun; Bhardwaj, Anil; Mukherjee, S.;

Published by: Journal of Geophysical Research: Space Physics Published on: 02/2016

YEAR: 2016 DOI: 10.1002/2015JA021841

Geomagnetic storms; High latitude low latitude coupling; Ionosphere; positive ionospheric storm

On the latitudinal changes in ionospheric electrodynamics and composition based on observations over the 76—77 E meridian from both hemispheres during a geomagnetic storm

Shreedevi, PR; Thampi, Smitha; Chakrabarty, D; Choudhary, RK; Pant, Tarun; Bhardwaj, Anil; Mukherjee, S;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2016 DOI:

2014

Limb Viewing Hyper Spectral Imager (LiVHySI) for airglow measurements onboard YOUTHSAT-1

Bisht, R.S.; Hait, A.K.; Babu, P.N.; Sarkar, S.S.; Benerji, A.; Biswas, A.; Saji, A.K.; Samudraiah, D.R.M.; Kirankumar, A.S.; Pant, T.K.; Parimalarangan, T.;

Published by: Advances in Space Research Published on: 08/2014

YEAR: 2014 DOI: 10.1016/j.asr.2014.01.016

airglow; Electron density; Ionosphere; Rayleigh; thermosphere; Volume emission

2013

First observational evidence of the modulation of the threshold height h\textquoterightF _c for the occurrence of equatorial spread F by neutral composition changes

[1]\ In the present study, the seasonal and solar activity variations of the threshold height for equatorial spread F occurrence irrespective of the polarity of the meridional winds during magnetically disturbed period are presented for the first time. The modulation of the seasonal pattern of the threshold height by the seasonal mean O/N₂ values is also examined. The Ionosonde data of magnetic equatorial location Trivandrum (8.5\textdegreeN, 76.5\textdegreeE) and low latitude station SHAR (13.7\t ...

Haridas, M.; Manju, G.; Pant, Tarun;

Published by: Journal of Geophysical Research: Space Physics Published on: 06/2013

YEAR: 2013 DOI: 10.1002/jgra.50331

Equatorial Spread F; O/N2; solar activity; Threshold height

Ionospheric response to a geomagnetic storm during November 8\textendash10, 2004

This paper investigates the response of the equatorial, and near equatorial, ionosphere to geomagnetic disturbances during the period November 8-10, 2004. Ionosonde data from Trivandrum (8.5\textdegreeN 77\textdegreeE and dip 0.5\textdegreeN) and SHAR (13.5\textdegreeN, 80.2\textdegreeE, dip \~5.5\textdegreeN), magnetic field data from Tirunelveli (8.7\textdegreeN, 76.9\textdegreeE, dip latitude 0.5\textdegreeS) and Alibag (18.64\textdegreeN, 72.87\textdegreeE), and GUVI O/N₂ data in the Indian longitude sector ...

Simi, K.; Manju, G.; Haridas, M.; Nayar, S.; Pant, Tarun; Alex, S.;

Published by: Earth, Planets and Space Published on: 05/2013

YEAR: 2013 DOI: 10.5047/eps.2012.09.005

Equatorial Electrojet; Equatorial ionization anomaly; geomagnetic storm; O/N2 ratio

Ionospheric response to a geomagnetic storm during November 8-10, 2004

Simi, KG; Manju, G; Haridas, MK; , Nayar; Pant, Tarun; Alex, S;

Published by: Earth, Planets and Space Published on:

YEAR: 2013 DOI:

First observational evidence of the modulation of the threshold height h Fc for the occurrence of equatorial spread F by neutral composition changes

Haridas, MK; Manju, G; Pant, Tarun;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2013 DOI: