Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21b..08q&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM21B-08
Physics
2704 Auroral Phenomena (2407), 2764 Plasma Sheet, 2772 Plasma Waves And Instabilities
Scientific paper
We present measurements by the Cluster satellites of Poynting flux directed toward the ionosphere on auroral field lines. During February/March, 2001, the Cluster perigee passes cut through the auroral zones in the near-midnight region, at approximately 5 RE. In several of these passes, Alfven waves, carrying Poynting flux primarily toward the ionosphere, were observed over a few degrees of invariant latitude in the high-latitude plasma sheet boundary region. Using data from the Electron Drift Instrument (EDI) and the Fluxgate Magnetometer (FGM), we calculate the Poynting flux of the waves, explore their spatial extent as constrained by the Cluster satellites, and examine their relation to convection boundaries. These waves presumably correspond to those recently reported by Wygant et al. and Keiling et al., although the flux in the Cluster events analyzed to date ( ~0.1 erg/cm22-s) is an order of magnitude lower than the most intense events seen by Polar at similar altitudes.
Baumjohann Wolfgang
Glassmeier K.-
Kletzing Craig A.
Matsui Hideki
Paschmann Goetz
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