S-transform analysis of geomagnetically induced currents during intense geomagnetic storms

Details S-transform analysis of geomagnetically induced currents during intense geomagnetic storms S-transform analysis of geomagnetically induced currents during intense geomagnetic storms

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53b..05k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM53B-05

Physics

2788 Magnetic Storms And Substorms (7954), 3255 Spectral Analysis (3205, 3280), 3280 Wavelet Transform (3255, 4455), 7900 Space Weather, 7904 Geomagnetically Induced Currents

Scientific paper

Novel time-frequency analysis method (S-transform) capable of handling noisy nonstationary signals is applied to study the properties of geomagnetically induced current (GIC) fluctuations in the Finnish natural gas pipeline during intense geomagnetic storms. New local time- and storm phase-dependent S-transform spectral properties of auroral region GIC fluctuations during the geomagnetic storms are reported. More specifically, the S-transform spectra have two distinct regions containing the most of the spectral power that persisted from storm to storm: main phase-related wide-band fluctuations driven possibly by substorm-type ionospheric activity centered around local midnight and recovery phase-related narrow-band fluctuations associated with Pc5 range geomagnetic pulsations in the local morning region. Based on this observed stability, a new S- transform-based statistical approach using, for example, an ensemble of different S-transform responses for known storms is proposed for GIC prediction.

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