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Title: Ionospheric modulations due to solar flares over Ahmedabad
Authors: Sharma, Som
Chandra, H
Vats, Hari Om
Pandya, N Y
Jain, Rajmal
Keywords: Solar flare
Ionospheric modulation
Magnetic field
Geomagnetic storm
Electron density
Issue Date: Oct-2010
Publisher: NISCAIR-CSIR, India
Abstract: Earth’s ionosphere responds quickly to the enhanced X-rays and<sup> </sup>ultraviolet (UV) radiation emitted from the Sun during solar flares. Ground and satellite based observations are important for unravelling the consequences<sup> </sup>of these essentially unpredictable events. Regular ionospheric soundings are made over Ahmedabad (23<sup>o</sup>N, 72.4<sup>o</sup>E) using KEL digital Ionosonde. Using this data, the influence of the excess X-ray emission from the flares / CMEs in different regions of the Earth’s ionosphere over Ahmedabad has been studied. Based on the X-ray spectral characteristics of the flares, the variation in the minimum frequency of reflection, f<sub>min</sub>, an indicator of the ionization in D-region of ionosphere, in contrast to daily quiet time variation, has been measured. The studies of the excess absorption, due to the solar flares, in the D-region of ionosphere over Ahmedabad are made for the events during 1996-2000. The deviation from Chapman’s layer behaviour of E-layer over Ahmedabad during few solar flares have been also found.
Description: 296-301
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.39(5) [October 2010]

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