Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm12b..04l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM12B-04
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
Movie-maps are presented of low-latitude horizontal-intensity magnetic disturbance for 20 large magnetic storms and 1 magnetically-quiescent period for the years 1999-2005. The movie maps are based on time-series data collected at up to 24 ground-based magnetic observatories. Using a technique similar to that used in the calculation of Dst, a quiet-time baseline is subtracted from the data time series from each observatory. The remaining disturbance time series are shown in a coordinate system that accommodates both Earth rotation and the universal-time dependence of magnetospheric-ionospheric disturbance. Each magnetic storm recorded in the movie-maps is different. While some standard interpretations about the storm-time equatorial ring current appear to apply to certain moments and certain phases of some storms, the movie-maps also show substantial variety in the local-time distribution of low-latitude magnetic disturbance, especially during storm commencements and storm main phases. All movie-maps are made freely available to the scientific community.
Gannon J. L.
Love Jeffrey J.
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