Physics – Plasma Physics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3812101h&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 12, CiteID L12101
Physics
Plasma Physics
1
Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Wave/Wave Interactions
Scientific paper
Field line resonances (FLRs) are important for transferring energy from fast mode waves to shear Alfvén waves in the Earth's magnetosphere. Using simultaneous multi-satellite observations from THEMIS and the IMAGE ground magnetometer array, we report on the transfer of energy from compressional magnetopause undulations through an FLR to the ionosphere. Energy diversion from the magnetosphere to the ionosphere took place at the FLR: we find net energy flux there to have comparable values in the radial and the field-aligned directions. The field-aligned energy flux, when mapped to the ionosphere, was 0.70 mW/m2 and consistent with the inferred Joule dissipation rate at that time. IMAGE's regional monitoring of wave activity reveals that the temporal evolution of the FLR wave power and energy transfer were correlated with the amplitude profile of magnetopause undulations, confirming these waves to be the FLR driver.
Angelopoulos Vassilis
Glassmeier Karl-Heinz
Hartinger Michael
Moldwin Mark B.
Nishimura Yukitoshi
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