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Found 5 entries in the Bibliography.

Showing entries from 1 through 5

2018
Neutralized solar wind ahead of the Earth s magnetopause as contribution to non-thermal exospheric hydrogen Their exciting result is inferred from radiative transfer modeling of Lyman-alpha resonance glow measurements made with the satellite TIMED/GUVI. To best fit these results with their Fahr, Hans; Nass, Uwe; Dutta-Roy, Robindro; Zoennchen, Jochen; Published by: Published on: YEAR: 2018 DOI: 10.5194/angeo-36-445-2018
2016
Conjugate hemisphere ionospheric response to the St. Patrick\textquoterights Day storms of 2013 and 2015 in the 100\textdegreeE longitude sector The effects of the St. Patrick\textquoterights Day geomagnetic storms of 2013 and 2015 in the equatorial and low-latitude regions of both hemispheres in the 100\textdegreeE longitude sector is investigated and compared with the response in the Indian sector at 77\textdegreeE. The data from a chain of ionosondes and GPS/Global Navigation Satellite Systems receivers at magnetic conjugate locations in the 100\textdegreeE sector have been used. The perturbation in the equatorial zonal electric field due to the prompt penetration of the magnetospheric convective under shielded electric field and the over shielding electric field gives rise to rapid fluctuations in the F₂ layer parameters. The direction of IMF B_z and disturbance electric field perturbations in the sunset/sunrise period is found to play a crucial role in deciding the extent of prereversal enhancement which in turn affect the irregularity formation (equatorial spread F) in the equatorial region. The northward (southward) IMF B_z in the sunset period inhibited (supported) the irregularity formation in 2015 (2013) in the 100\textdegreeE sector. Large height increase (h_mF₂) during sunrise produced short-duration irregularities during both the storms. The westward disturbance electric field on 18 March inhibited the equatorial ionization anomaly causing negative (positive) storm effect in low latitude (equatorial) region. The negative effect was amplified in low midlatitude by disturbed thermospheric composition which produced severe density/total electron content depletion. The longitudinal and hemispheric asymmetry of storm response is observed and attributed to electrodynamic and thermospheric differences. Kalita, Bitap; Hazarika, Rumajyoti; Kakoti, Geetashree; Bhuyan, P.; Chakrabarty, D.; Seemala, G.; Wang, K.; Sharma, S.; Yokoyama, T.; Supnithi, P.; Komolmis, T.; Yatini, C; Le Huy, M.; Roy, P.; Published by: Journal of Geophysical Research: Space Physics Published on: 10/2016 YEAR: 2016 DOI: 10.1002/2016JA023119
2014
Effects of transionospheric signal decorrelation on Global Navigation Satellite Systems (GNSS) performance studied from irregularity dynamics around the northern crest of the EIA Transionospheric satellite navigation links operate primarily at L band and are frequently subject to severe degradation of performances arising out of ionospheric irregularities. Various characteristic features of equatorial ionospheric irregularity bubbles like the drift velocity, characteristic velocity, decorrelation time, and decorrelation distance can be determined using spaced aerial measurements at VHF. These parameters measured at VHF from a station Calcutta situated near the northern crest of the Equatorial Ionization Anomaly (EIA) in the geophysically sensitive Indian longitude sector have been correlated with L band scintillation indices and GPS position accuracy parameters for identifying possible proxies to L band scintillations. Good correspondences have been observed between decorrelation times and distances at VHF with GPS S₄ and Position Dilution of Precision during periods of GPS scintillations (S₄ \> 0.3) for February\textendashApril 2011, August\textendashOctober 2011, and February\textendashApril 2012. A functional relation has been developed between irregularity drift velocity measured at VHF and S₄ at L band during February\textendashApril 2011, and validation of measured S₄ and predicted values performed during August\textendashOctober 2011 and February\textendashApril 2012. Significant improvement in L band scintillation prediction and consequent navigational accuracy will result using such relations derived from VHF irregularity measurements which are much simpler and inexpensive. Das, T.; Roy, B.; Paul, A.; Published by: Radio Science Published on: 10/2014 YEAR: 2014 DOI: 10.1002/rds.v49.1010.1002/2014RS005406 GNSS position determination accuracy under adverse ionospheric conditions; GUVI; irregularity dynamics at VHF
2008
Dynamics of the nonmigrating semidiurnal tide in the mesosphere and lower thermosphere over the Antarctic and Arctic This dissertation focuses on the structure of the nonmigrating semidiurnal tide in the high latitude Mesosphere and Lower Thermosphere (MLT). Comparing the spatial structure and Hiroyuki, Iimura; Published by: Published on: YEAR: 2008 DOI:
2006
Equatorial anomaly development mapped by TIMED/GUVI: Occurrence/suppression of scintillations at low latitudes and their modeling Basu, S; Basu, S; Makela, J; Miller, E; Dasgupta, A; Roy, S; Huba, J; Groves, K; Rich, F; Published by: Eos Trans. AGU Published on: YEAR: 2006 DOI:

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