Akebono satellite observations of Alfvén waves related to dayside small-scale field-aligned currents

Details Akebono satellite observations of Alfvén waves related to dayside small-scale field-aligned currents Akebono satellite observations of Alfvén waves related to dayside small-scale field-aligned currents

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0474h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0474

Physics

2483 Wave/Particle Interactions, 2708 Current Systems (2409), 2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

In the cusp and its surrounding region, burst-like disturbances of magnetic and electric fields are often observed on Freja, FAST, Akebono, and Cluster spacecraft. Recent studies suggest that these small-scale disturbances are signatures of the dispersive Alfvén wave (DAW) and the ionospheric Alfvén resonator (IAR) excited in the magnetosphere-ionosphere coupled system [Hirano et al., 2004]. These small-scale disturbances would also carry small-scale field-aligned currents (FACs). In our recent study, we investigated statistically the polar distributions of small-scale FACs and showed that small-scale FACs are enhanced in the vicinity of the cusp, particularly in the prenoon Region 1 current system. These dayside small-scale FACs are enhanced on sunlit conditions, suggesting that small-scale FACs are significantly affected by ionospheric conductivity. The purpose of this study is to elucidate the characteristics of Alfvén waves related to small-scale FACs using Akebono magnetic and electric field data. Comparing with the in-situ electron density data, the role of DAW and IAR on the generation of small-scale FACs are discussed, focusing particularly on the altitude dependence.

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