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Features of discrete VLF emissions observed at Gulmarg, India during the magnetic storm of 6-7 March, 1986

Singh, R and Singh, AK and Singh, D and Singh, RP (2007) Features of discrete VLF emissions observed at Gulmarg, India during the magnetic storm of 6-7 March, 1986. Journal of Earth System Science, 116 (6). pp. 553-559.

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Abstract

During the analysis of archived VLF data from Indian low latitude ground stations, some discrete VLF emissions recorded at the low latitude ground station Gulmarg (geomagnetic latitude 24°26′N; geomagnetic longitude 147°09′E, L = 1.28) during moderate magnetic storm activity (Σ K P − = 32, K P index varies from 4 to 6 during the observation period) on 6/7 March, 1986 are presented in this paper. The dynamic spectra of these discrete VLF emissions were observed along with tweeks and its harmonics, which is interesting and complex to explain. In most of the events the harmonic frequency of tweeks correlates with the starting frequency of harmonics of discrete emissions. In order to explain the observed features of discrete VLF emissions, we propose cyclotron resonance interaction between whistler mode wave and energetic electrons of inner radiation belt as possible generation mechanism. An attempt is also made to determine parallel energy, anisotropy and wave growth relevant to the generation process of VLF emissions

Item Type: Article
Additional Information: Copyright of this article belongs to Springer
Uncontrolled Keywords: geomagnetic storm; harmonic analysis; magnetosphere; plasma; spectral analysis; upper atmosphere
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 22 Feb 2015 06:35
Last Modified: 22 Feb 2015 06:35
URI: http://moeseprints.incois.gov.in/id/eprint/1870

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