GUVI Biblio





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Found 14 entries in the Bibliography.


Showing entries from 1 through 14


2022

The investigation on daytime conjugate hemispheric asymmetry along 100°E longitude using observations and model simulations: New insights

The hemispherical asymmetry of the low latitude region along 100°E ± 5°E is scrutinized for the year 2015 at magnetically conjugate points on seasonal and intra-seasonal time scales. Two conjugate Ionosonde station pairs are selected- one pair in the inner valley (from SEALION) and the other in the outer edges of the EIA region. The anomaly in the stations is estimated using the difference of low latitude NmF2 from the dip equatorial NmF2 in the same meridian. A monthly average scheme is used instead of a seasonal mean, ...

Kalita, B.; Bhuyan, P.; Nath, S.; Choudhury, M.; Chakrabarty, D.; Wang, K.; Hozumi, K.; Supnithi, P.; Komolmis, T.; . Y. Yatini, C; Le Huy, M.;

Published by: Advances in Space Research      Published on: may

YEAR: 2022     DOI: 10.1016/j.asr.2022.02.058

NmF2; asymmetry; Conjugate; EIA; model; Hemisphere; hmF2; Subsolar

2019

Spatial asymmetry in topside ion density and vertical E \texttimes B plasma drift velocity within 75\textdegreeE\textendash95\textdegreeE

The ion density measured by the Ionospheric Plasma and Electrodynamics Instrument (IPEI) on board the ROCSAT -1 over the 75\textdegreeE and ...

Kakoty, Rimpy; Bora, Saradi; Bhuyan, Pradip;

Published by: Advances in Space Research      Published on: 02/2019

YEAR: 2019     DOI: 10.1016/j.asr.2018.10.013

2017

Seasonal and solar cycle effects on TEC at 95\textdegreeE in the ascending half (2009\textendash2014) of the subdued solar cycle 24: Consistent underestimation by IRI 2012

TEC measured at Dibrugarh (27.5\textdegreeN, 94.9\textdegreeE, 17.5\textdegreeN Geomag.) from 2009 to 2014 is used to study its temporal characteristics during the ascending half of solar cycle 24. The measurements provide an opportunity to assess the diurnal, seasonal and longterm predictability of the IRI 2012 (with IRI Nequick, IRI01-corr, IRI 2001topside options) during this solar cycle which is distinctively low in magnitude compared to the previous cycles. The low latitude station Dibrugarh is normally located at th ...

Kakoti, Geetashree; Bhuyan, Pradip; Hazarika, Rumajyoti;

Published by: Advances in Space Research      Published on: 07/2017

YEAR: 2017     DOI: 10.1016/j.asr.2016.09.002

Seasonal and solar cycle effects on TEC at 95° E in the ascending half (2009—2014) of the subdued solar cycle 24: Consistent underestimation by IRI 2012

Kakoti, Geetashree; Bhuyan, Pradip; Hazarika, Rumajyoti;

Published by: Advances in Space Research      Published on:

YEAR: 2017     DOI:

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 penetrat ...

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

Conjugate hemisphere ionospheric response to the St. Patrick s Day storms of 2013 and 2015 in the 100° E longitude sector

Kalita, Bitap; Hazarika, Rumajyoti; Kakoti, Geetashree; Bhuyan, PK; Chakrabarty, D; Seemala, Gopi; Wang, K; Sharma, S; Yokoyama, T; Supnithi, P; , others;

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

YEAR: 2016     DOI:

Ionospheric response to the 17-18 March 2015 geomagnetic storm as seen from multiple TEC and NmF2 measurements along 100° E

Bhuyan, Pradip; Yokoyama, Tatsuhiro; Kalita, Bitap; Seemala, GK; Hazarika, Rumajyoti; Komolmis, Tharadol; Yatini, Clara; Chakrabarty, Dibyendu; Supnithi, Pornchai;

Published by: 41st COSPAR Scientific Assembly      Published on:

YEAR: 2016     DOI:

2015

NmF2 and hmF2 measurements at 95\textdegree E and 127\textdegree E around the EIA northern crest during 2010\textendash2014

The characteristics of the F2 layer parameters NmF2 and hmF2 over Dibrugarh (27.5\textdegree N, 95\textdegree E, 17\textdegree N geomagnetic, 43\textdegree dip) measured by a Canadian Advanced Digital Ionosonde (CADI) for the period of August 2010 to July 2014 are reported for the first time from this low mid-latitude station lying within the daytime peak of the longitudinal wave number 4 structure of equatorial anomaly (EIA) around the northern edge of anomaly crest. Equinoctial asymmetry is clearly observed at all solar ...

Kalita, Bitap; Bhuyan, Pradip; Yoshikawa, Akimasa;

Published by: Earth, Planets and Space      Published on: Jan-12-2015

YEAR: 2015     DOI: 10.1186/s40623-015-0355-3

2014

Spatial distribution of TEC across India in 2005: Seasonal asymmetries and IRI prediction

Total electron content measured simultaneously at 10 locations over India during the low solar activity year 2005 is used to examine the temporal and spatial asymmetries and also to assess the predictability of the International Reference Ionosphere in respect of the observed asymmetrical distribution. The stations are distributed in latitude along 77\textdegreeE and in longitude along 23\textdegreeN forming a meridional and a zonal chain respectively. A longitudinal gradient positive towards east was observed in the dayt ...

Hazarika, Rumajyoti; Bhuyan, Pradip;

Published by: Advances in Space Research      Published on: 11/2014

YEAR: 2014     DOI: 10.1016/j.asr.2014.07.011

Equatorial ionization anomaly; Ionosphere; IRI; solar activity; TEC

Effects of prolonged southward interplanetary magnetic field on low-latitude ionospheric electron density

The present work describes the low-latitude ionospheric variability during an unusually prolonged (~33 h) geomagnetically disturbed condition that prevailed during 15\textendash16 July 2012. The low-latitude electron density in summer hemisphere, investigated using ground- and satellite-based observations, responded to this by generating strong negative ionospheric storm on 16 July. The maximum electron density on 16 July over Indian low latitudes was reduced by more than 50\% compared to that on a geomagnetically quiet d ...

Bagiya, Mala; Hazarika, Rumajyoti; Laskar, Fazlul; Sunda, Surendra; Gurubaran, S.; Chakrabarty, D.; Bhuyan, P.; Sridharan, R.; Veenadhari, B.; Pallamraju, D.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 07/2014

YEAR: 2014     DOI: 10.1002/2014JA020156

low-latitude ionosphere; neutral winds; prolonged southward IMF Bz; thermospheric neutral composition

2013

GPS TEC near the crest of the EIA at 95\textdegreeE during the ascending half of solar cycle 24 and comparison with IRI simulations

Total electron content (TEC) data obtained from GPS dual frequency measurements during the ascending half of the solar cycle 24 from 2009 to 2012 over Dibrugarh (27.5\textdegreeN, 94.9\textdegreeE; 17.6\textdegreeN MLAT) have been used to study the diurnal, seasonal, annual and solar cycle variation of TEC. The measurements reported here are for the first time from the location situated at the poleward edge of the northern equatorial ionization anomaly (EIA) and within the peak region of the longitudinal wave number 4 (WN ...

Bhuyan, Pradip; Hazarika, Rumajyoti;

Published by: Advances in Space Research      Published on: 10/2013

YEAR: 2013     DOI: 10.1016/j.asr.2013.06.029

Equatorial ionosphere; GPS; Ionosphere; IRI; TEC

GPS TEC near the crest of the EIA at 95 E during the ascending half of solar cycle 24 and comparison with IRI simulations

Bhuyan, Pradip; Hazarika, Rumajyoti;

Published by: Advances in Space Research      Published on:

YEAR: 2013     DOI:

2009

The equatorial ionization anomaly at the topside F region of the ionosphere along 75 E

Electron density measured by the Indian satellite SROSS C2 at the altitude of ∼500km in the 75°E longitude sector for the ascending half of the solar cycle 22 from 1995 to 1999 are used to study the position and density of the equatorial ionization anomaly (EIA). Results show that the latitudinal position and peak electron density of the EIA crest and crest to trough ratios of the anomaly during the 10:00–14:00 LT period vary with season and from one year to another. Both EIA crest position and density are found to be a ...

Bhuyan, P.K.; Bhuyan, K.;

Published by: Advances in Space Research      Published on:

YEAR: 2009     DOI: https://doi.org/10.1016/j.asr.2008.09.027

Ionosphere; topside ionosphere; equatorial ionization anomaly (EIA); Equatorial electrojet (EEJ); SROSS C2

The equatorial ionization anomaly at the topside F region of the ionosphere along 75 E

Electron density measured by the Indian satellite SROSS C2 at the altitude of ∼500km in the 75°E longitude sector for the ascending half of the solar cycle 22 from 1995 to 1999 are used to study the position and density of the equatorial ionization anomaly (EIA). Results show that the latitudinal position and peak electron density of the EIA crest and crest to trough ratios of the anomaly during the 10:00–14:00 LT period vary with season and from one year to another. Both EIA crest position and density are found to be a ...

Bhuyan, P.K.; Bhuyan, K.;

Published by: Advances in Space Research      Published on:

YEAR: 2009     DOI: https://doi.org/10.1016/j.asr.2008.09.027

Ionosphere; topside ionosphere; equatorial ionization anomaly (EIA); Equatorial electrojet (EEJ); SROSS C2



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