Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41c1891x&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM41C-1891
Physics
[2700] Magnetospheric Physics, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
The magnetosphere-ionosphere contains a number of current systems, such as the ring current, tail current, field-aligned current, and various electrojets in the ionosphere. These currents vary on a wide range of spatial and temporal scales and physically couple with each other. To study the complicated behaviors of these coupled current systems, the ground-based magnetometer has been a useful tool, but the magnetometer data are always multiple scaled and intermittent due to the nature of these current systems. To distinguish these geomagnetic effects with multiple temporal and frequency scales, the wavelet analysis technique is especially suitable because of its special abilities of presenting information in both temporal and frequency domains. In this presentation, the geomagnetic disturbances and the ring current variability during storm and quiet times are studied by using wavelet analysis and ground-based magnetic data from multiple stations. First, the strengths of the wavelet technique for geomagnetic data analysis are investigated by an assessment study of a newly developed wavelet-based index of storm activity (WISA). Second, the geomagnetic effects related to the symmetric and asymmetric ring currents are characterized by applying wavelet analysis to geomagnetic data from multiple stations. Third, the temporal and spatial variability of the symmetric ring current is studied by applying the wavelet analysis technique to multiple components of magnetic data from multiple stations. The results show that the wavelet analysis of magnetic data from multiple stations provides a powerful tool for geomagnetic disturbance and storm studies. The unique strengths of the wavelet method allow us to quantitatively distinguish the geomagnetic effects of ring current variations from other M-I current systems. It also allows us to separate the magnetic effects of the symmetric ring current from those caused by the asymmetric ring current and to study the spatial and temporal variability of the ring currents, which are essential for understanding the dynamics of the ring currents as well as the magnetic storm processes. Quantitative information of the spatial and temporal variability of the ring currents is also crucial and invaluable for the national space weather programs. The techniques developed here can be used as a real-time monitoring tool for space weather applications.
Jach Agnieszka
Kokoszka Piotr
Sojka Jan J.
Xu Zhiyong
Zhu Lijun
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