Statistics – Applications
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1661z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1661
Statistics
Applications
2409 Current Systems (2721), 2431 Ionosphere/Magnetosphere Interactions (2736), 2721 Field-Aligned Currents And Current Systems (2409), 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The current flowing in the magnetosphere-ionosphere (M-I) form a complicated multiscale geosystem that contains the temporal scales from seconds to days. Due to the nature of this current system, the magnetic effects recorded by the ground-based magnetometers are multi-scaled, impulsive, and asynchronous with non-stationary frequency spectra. Therefore, they are not amenable to traditional time domain or spectral (Fourier) analysis. This talk is to present the results and progresses of a project supported by the NSF Mathematics- Geoscience Joint Program, in which statistical study with the use of the wavelet analysis technique, which is especially suitable for analyzing the data that are impulsive and have time-dependent spectra, are performed upon a large database of ground-based magnetometer measurements to study the characteristics of the M-I current system. Specifically, the talk will cover 1) the development of a wavelet-based index of magnetic storm activity (WISA); 2) the strengths of the WISA over the Dst; 3) cross-wavelet analysis of the symmetric and asymmetric parts of the ring current; 4) an improved WISA that includes the day-to-day dynamic Sq variations. The statistical mathematical tools and the wavelet-based magnetic indices developed by this project will have a broad range of space weather applications and will be very useful for the space science community.
Jach Agnieszka
Kokoszka Piotr
Maslova I.
Sojka Jan J.
Xu Zhiyong
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