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Title: Vertical variance analysis of geomagnetic disturbance during solar cycle 23
Authors: Abraham, Abraham
Gangadharan, Renuka
Cherian, Ligi
Varghese, Asha Anie
Chandran, Rakesh
Mathew, Tiju Joseph
Chacko, Jim
Varghese, Blessy
Vijayan, Gopika Sreela
Nandakumar, Ankitha
Sankarapillai, Lekshmi
Prasannan, Syamily
Keywords: Geomagnetic disturbance;Solar wind–magnetosphere interactions;Magnetic storms
Issue Date: Dec-2020
Publisher: CSIR-NISCAIR, India
Abstract: The geomagnetic field consists of temporal variations induced primarily by the variations in the solar wind and embedded interplanetary magnetic field. 34 stations across the Earth have been categorized in this paper on the basis of their geomagnetic disturbance during solar cycle 23 (1997-2008). The Vertical Variance (VV) disturbance quantifier has been used to develop such profile. The latitude profile of geomagnetic disturbance has been found to exhibit a typical ‘Knee’ behaviour, with the fluctuation content seen to rise sharply beyond this critical latitude determined near 52° latitude. The increasing trend in geomagnetic fluctuation content however is seen to end around the auroral oval beyond where abrupt variations has been observed indicating the transition from closed to open magnetic field lines. The physical mechanism behind this trend has also been explored. The VV analysis of geomagnetic disturbance has revealed prominent features of solar wind – magnetosphere coupling.
Page(s): 300-309
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.49(4) [December 2020]

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