Global UltraViolet Imager

GUVI Biblio


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Found 6 entries in the Bibliography.

Showing entries from 1 through 6


Solar and interplanetary events that drove two CIR-related geomagnetic storms of 1 June 2013 and 7 October 2015, and their ionospheric responses at the American and African equatorial ionization Anomaly regions

This study investigates the sequence of solar and interplanetary events that drove the 1 June 2013 and October 2015 geomagnetic storms and how the American (68°–78oE) and African (32°–42oE) Equatorial Ionization Anomaly (EIA) regions responded to them. We constructed the EIA structures by using Total Electron Content (TEC) and ionospheric irregularities derived from Global Navigation Satellite System (GNSS) receivers along with the study locations. We also analyzed disturbed time ionospheric electric field and model da ...

Oyedokun, Oluwole; Amaechi, P.; Akala, A.; Simi, K.; Ogwala, Aghogho; Oyeyemi, E.;

Published by: Advances in Space Research      Published on: mar

YEAR: 2022     DOI: 10.1016/j.asr.2021.12.027

geomagnetic storm; total electron content; Corotating Interacting Region; ionospheric irregularities


Responses of the Indian Equatorial Ionization Anomaly to two CME-induced geomagnetic storms during the peak phase of solar cycle 24

This work analyzes the geo-effectiveness of Coronal Mass Ejection- (CME-) induced storms by investigating the responses of ionospheric Vertical Total Electron Content (VTEC) and the Equatorial Ionization Anomaly (EIA) over the Indian sector to two storms. One of the storms occurred on February 19, 2014 (SYM-H: −120 nT), while the other occurred on June 23, 2015 (SYM-H: −204 nT). Both storms were driven by full halo CMEs. Global TEC maps were used to characterize VTEC variations during the storms. June 23, 2015 storm was ...

Simi, K.; Akala, A.; Krishna, Siva; Amaechi, Paul; Ogwala, Aghogho; Ratnam, Venkata; Oyedokun, O.;

Published by: Advances in Space Research      Published on: oct

YEAR: 2021     DOI: 10.1016/j.asr.2021.06.013

Coronal mass ejection; Disturbance dynamo electric field; geomagnetic storm; prompt penetration electric field; total electron content

Solar Origins of August 26, 2018 Geomagnetic Storm: Responses of the Interplanetary Medium and Equatorial/Low-Latitude Ionosphere to the Storm

This study investigates the solar origins of August 26, 2018 geomagnetic storm and the responses of the interplanetary medium and equatorial/low-latitude ionosphere to it. We used a multiinstrument approach, with observations right from the solar surface to the Earth. Our results showed that the G3 geomagnetic storm of August 26, 2018 was initiated by a solar filament eruption of August 20, 2018. The storm was driven by an aggregation of weak Coronal Mass Ejection (CME) transients and Corotating Interaction Regions/High Spee ...

Akala, A.; Oyedokun, O.; Amaechi, P.; Simi, K.; Ogwala, A.; Arowolo, O.;

Published by: Space Weather      Published on:

YEAR: 2021     DOI: 10.1029/2021SW002734


Space Weather Program at Antarctica

The use of GPS (Global Positioning System) in diverse areas such as surveying, enroute navigation and precision approach of aircraft, deformation monitoring, and various land/marine navigation applications necessitate high accuracy and availability. In the presence of time varying irregularities in ionospheric degrades the performance of the GPS receiver.

Tiwari, R; Purohit, PK; Gwal, AK;

Published by:       Published on:

YEAR: 2019     DOI:


Study of TEC changes during geomagnetic storms occurred near the crest of the equatorial ionospheric ionization anomaly in the Indian sector

Trivedi, Richa; Jain, Amit; Jain, Sudhir; Gwal, A.K.;

Published by: Advances in Space Research      Published on: Jan-11-2011

YEAR: 2011     DOI: 10.1016/j.asr.2011.08.008


EC response during severe geomagnetic storms near the crest of equatorial ionization anomaly

The responses of the ionosphere near equatorial anomaly crest as observed at Bhopal (geographic 23.2\textdegreeN, 77.4\textdegreeE, and magnetic latitude 14.2\textdegreeN), India for geomagnetic storms during 15 May 2005 (SSC: 0239 hrs UT, SymH: -305 nT) and 24 August 2005 (SSC: 0615 hrs UT, SymH: -179 nT) has been studied using total electron content (TEC). TEC data is recorded by GPS Ionospheric Scintillation and TEC Monitor (GISTM) GSV4004A at Bhopal. The temporal variations of vertical total electron content (VTEC) du ...

Jain, A.; Tiwari, S.; Jain, S.; Gwal, A.;

Published by: Indian Journal of Radio \& Space Physics      Published on: 03/2010

YEAR: 2010     DOI: