NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.39 [2010] >
IJRSP Vol.39(1) [February 2010] >


Title: TEC response during severe geomagnetic storms near the crest of equatorial ionization anomaly
Authors: Jain, Amit
Tiwari, Sunita
Jain, Sudhir
Gwal, A K
Keywords: Total electron content
Ionospheric disturbance
Prompt penetration electric fields (PPE)
Travelling atmospheric disturbances (TAD)
Disturbance dynamo electric fields (DDE)
Issue Date: Feb-2010
Publisher: CSIR
PACS No.: 94.20.Vv; 94.30.Lr
Abstract:  The responses of the ionosphere near equatorial anomaly crest as observed at Bhopal (geographic 23.2°N, 77.4°E, and magnetic latitude 14.2°N), 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) during these storms were analysed. Fifteen minute average of VTEC is considered for analysis. More than +68% and +70% deviation in VTEC was observed for 15 May 2005 and 24 August 2005 storms, respectively, relative to average of five quiet days of the respective months. Significant deviations in VTEC during the main phase of the storms were found to be associated with the prompt penetration of electric fields which originate due to the under-shielding and over-shielding conditions. Peaks like structure in EIA region were observed for both the storms. Peaks like structure well before the fountain effect in EIA region were observed for 15 May 2005. Latitudinal enhancement of anomaly peak in EIA region was also observed for both the storms. Suppressed equatorial electrojet strength and consequently VTEC, observed on 25 August 2005 during recovery phase of the storm, are mainly due to the thermospheric composition changes and also possibly due to the delayed disturbance dynamo electric fields in this region. The range error is also discussed in the present paper.
Page(s): 11-24
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.39(1) [February 2010]

Files in This Item:

File Description SizeFormat
IJRSP 39(1) 11-24.pdf1.17 MBAdobe PDFView/Open
 Current Page Visits: 823 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 570069 since 06-Feb-2009  Last updated on 14-Aug-2014Webmaster: nopr@niscair.res.in