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| Titel |
Schumann resonance frequency variations observed in magnetotelluric data recorded from Garhwal Himalayan region India |
| VerfasserIn |
R. Chand, M. Israil, J. Rai |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 9 ; Nr. 27, no. 9 (2009-09-23), S.3497-3507 |
| Datensatznummer |
250016645
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3497-2009.pdf |
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| Zusammenfassung |
| Schumann resonance (SR) frequency variation has been studied using
Magnetotelluric (MT) data recorded in one of the world's toughest
and generally inaccessible Himalayan terrain for the first time in
the author's knowledge. The magnetotelluric data, in the form of
orthogonal time varying electric and magnetic field components
(Ex, Ey, Bx and By), recorded during 10 March–23 May
2006, in the Himalayan region, India, at elevations between
1228–2747 m above mean sea level (amsl), were used to study the SR
frequency variation. Electromagnetic field components, in the form
of time series, were recorded at 64 Hz sampling frequency at a site
located away from the cultural noise. Spectral analysis of time
series data, at a frequency resolution of 0.03 Hz, has been
performed using Fast Fourier Transform (FFT) algorithm. Spectral
stabilization in three Schumann resonance modes is achieved by
averaging the power spectral magnitude of 32 data segments, each
with 2048 sample data. Amplitude variation in the Schumann resonance
frequency associated with day-night, sunrise and terminator effect
was observed. Average diurnal variation in the first three Schumann
resonance frequencies associated with magnetic field components is
presented. The maximum frequency variation of about 0.3, 0.4 and
0.7 Hz was observed in the first, second and third mode,
respectively. The frequency variations observed in electric and
magnetic field components also show phase shift and varying
attenuation. The SR frequency variation has been used to define the
ionospheric electron density variation in the Himalayan region,
India. |
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