Multi-point Characterization of ULF Wave Energy Transport in the Magnetosphere.

Details Multi-point Characterization of ULF Wave Energy Transport in the Magnetosphere. Multi-point Characterization of ULF Wave Energy Transport in the Magnetosphere.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm31a1222r&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM31A-1222

Physics

2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities

Scientific paper

There are a number of mechanisms by which global ULF oscillations can be produced in the magnetosphere. For example, during fast solar wind speed events, flow instabilities can drive surface waves on the magnetopause which in turn can drive compressional waves into the magnetosphere. Alternately, oscillations in solar wind parameters can also produce similar compressional oscillations. These compressional waves are a source of ULF wave activity throughout the magnetosphere-ionosphere system. We present event studies of global ULF wave oscillations whereby favourable radial alignment of spacecraft in the magnetosphere and conjugate measurements of field line resonances (FLRs) in the ionosphere allow the tracking of ULF wave energy in the near-Earth environment. We study an interval on the 25th November 2001 and track energy transport from the magnetopause boundary oscillations from the magnetopause through the FLR mode-conversion region and into the ionosphere. We calculate the in-situ Poynting flux to fully characterise the nature of these oscillations. Using radial alignments of multiple spacecraft (e.g. Equator-S, Geotail, Polar) and meso-scale conjugate ionospheric measurements during additional intervals, we further examine ULF wave energy transport to determine the ULF response to a range of solar wind drivers.

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