Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51a1752m&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM51A-1752
Physics
Plasma Physics
[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [7839] Space Plasma Physics / Nonlinear Phenomena, [7900] Space Weather, [7924] Space Weather / Forecasting
Scientific paper
The coupling of the solar wind to the magnetosphere is examined empirically with linear prediction filters. Various proposed solar wind coupling functions are used as input and different magnetic indices are used as the output from the filter. Average filters are calculated for different times in the solar cycle, different months of the year, and different levels of solar wind dynamic pressure. Preliminary results indicate that there is no detectable seasonal variation in the VBs to AL filter, but there is a strong maximum in the VBs-AU filter centered on summer solstice. Both filters show a maximum in coupling in the declining phase of the solar cycle, and at the stream interface within a corotating interaction region, both times of high dynamic pressure. Filters calculated for different levels of dynamic pressure clearly show that the weakest coupling occurs for the highest pressure. We also show initial results for multi channel filters that self-consistently estimate both the reconnection and viscous contributions to coupling. Viscous coupling accounts for about 5% of the AL index while reconnection accounts for about 55%. The remaining variance in the index is uncorrelated with the solar wind and presumably a consequence of both internal processes and noise in the input and output data. State-dependent linear prediction filters provide a means to approximate the non-linear response of the magnetosphere to changes in the solar wind.
Baker Daniel N.
McPherron Robert L.
Pulkkinen Tuija I.
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