Energy Transport in the Terrestrial Polar Cap Regions by Alfvén Waves as Observed by the Electron Drift Instrument (EDI) Aboard the CLUSTER Spacecrafts

Details Energy Transport in the Terrestrial Polar Cap Regions by Alfvén Waves as Observed by the Electron Drift Instrument (EDI) Aboard the CLUSTER Spacecrafts Energy Transport in the Terrestrial Polar Cap Regions by Alfvén Waves as Observed by the Electron Drift Instrument (EDI) Aboard the CLUSTER Spacecrafts

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52a0543p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM52A-0543

Physics

2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We present analysis of low frequency, magnetohydrodynamic (Alfvén) waves observed during multiple passes of the CLUSTER satellites over both the northern and southern polar cap regions. Electron Drift Instrument (EDI) measurments of the wave electric field, combined with Fluxgate Magnetometer (FGM) measurments of the wave magnetic field are used to characterize wave mode, strength, polarization, and energy and propagation direction. Presently, our survey of these wave events reveals predominantly transverse waves with energy transport during northern (southern) passes directed largely into the northern (southern) ionosphere. Although this preferential direction exists, many of our cases have very strong standing components, resulting in virtually no preferred direction for energy transport. This poses an interesting problem in light of the fact that these polar cap field lines are presumed to be open. We will also discuss possible solar-terrestrial energy transfer mechanisms and magnetopause configurations which make the existence and characteristics of these waves possible.

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