Geotail-CLUSTER Correlative Measurements of Plasma Sheet Poynting Flux During the Course of Substorms

Details Geotail-CLUSTER Correlative Measurements of Plasma Sheet Poynting Flux During the Course of Substorms Geotail-CLUSTER Correlative Measurements of Plasma Sheet Poynting Flux During the Course of Substorms

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51a0793a&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51A-0793

Physics

2407 Auroral Ionosphere (2704), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions, 2744 Magnetotail

Scientific paper

Two fortuitous conjunctions between Geotail in the equatorial plasma sheet and CLUSTER at ~4Re altitude on plasma sheet field lines are utilized to study the evolution of Poynting flux from its source to the aurora. Increased wave power at both satellites correlates with increased electrojet and auroral activity. The four Cluster satellites show qualitatively very similar Poynting fluxes and overall wave behavior. The differences between the satellites are being used to characterize the temporal and spatial properties of the observed waves. Of primary interest is the propagation and dissipation of the waves along the field lines, which in turn, depends critically on the perpendicular wavelength and propagation speed. We discuss ionospheric closure via Alfven waves or stationary field aligned currents as revealed by multiple crossings of the same region. We finally explore the possibility of high altitude dissipation (between CLUSTER and Geotail), if perpendicular scale-lengths are already on the ion gyroradius scale size at those altitudes.

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