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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.41 [2012] >
IJRSP Vol.41(2) [April 2012] >
| Title: | Effect of solar flares on ionospheric TEC at Varanasi, near EIA crest, during solar minimum period |
| Authors: | Kumar, Sanjay
Singh, A K |
| Keywords: | Ionospheric total electron content (TEC)
Solar flare, EUV flux
Sudden ionospheric disturbances (SID) |
| Issue Date: | Apr-2012 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 94.20.dt; 96.60.qe |
| Abstract: | A solar flare is a sudden release of energy
usually near a complex group of sunspots. The interaction of solar flare
radiations with constituents of ionosphere produces immediate increase in the
electron density in the ionosphere. The
present paper describes the effect of solar flare on ionospheric total electron
contents (TEC) using global positioning system (GPS) data recorded at Varanasi,
a station situated near equatorial ionization anomaly (EIA) crest region during
solar minimum period. In this study, total four flares have been selected to
study the effect of solar flares on ionosphere during the year 2008, which is a
solar minimum period. The enhancements on ionospheric TEC have been observed
during the period of solar flares. The maximum enhancement of TEC during
solar flare compared to quiet mean TEC
up to 24 TEC units have been observed. A significant
enhancement in TEC is observed at regions around the EIA crest region during
the flare in association with: (a) the flare related EUV flux enhancement and consequent increased
production of ionization, and (b) changes in the equatorial electrodynamics. The
magnitude of enhancement in ionospheric TEC appears to be dependent on the
class of the solar flare. |
| Page(s): | 141-147 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.41(2) [April 2012]
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