S-transform view of geomagnetically induced currents during geomagnetic superstorms

被引：30
|
作者：
Pulkkinen, Antti
Kataoka, Ryuho
机构：
[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[2] Natl Inst Informat & Commun Technol, Tokyo, Japan
[3] Nagoya Univ, Solar Terr Environm Lab, Chikusa Ku, Nagoya, Aichi 4648601, Japan
来源：
GEOPHYSICAL RESEARCH LETTERS | 2006年 / 33卷 / 12期
关键词：
D O I：
10.1029/2006GL025822
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
A novel time-frequency analysis method (S-transform) capable of handling noisy non-stationary signals is applied to study the properties of geomagnetically induced current (GIC) fluctuations in the Finnish natural gas pipeline. New local time- and storm phase-dependent S-transform spectral properties of auroral region GIC fluctuations during geomagnetic superstorms 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 a substorm-type ionospheric activity centered around the 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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页数：4
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