Polar distributions of small-scale magnetic disturbances derived from the Akebono magnetometer data

Details Polar distributions of small-scale magnetic disturbances derived from the Akebono magnetometer data Polar distributions of small-scale magnetic disturbances derived from the Akebono magnetometer data

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41b0573h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41B-0573

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions, 4275 Remote Sensing And Electromagnetic Processes (0689), 6030 Magnetic Fields And Magnetism

Scientific paper

In the cusp and its vicinity, burst-like disturbances of magnetic and electric fields are often observed on Freja, FAST, and Akebono spacecraft. Recent studies suggest that these small-scale disturbances are signatures of the dispersive Alfv´ {e}n waves (DAW) and the ionospheric Alfv´ {e}n resonator (IAR) excited in the topside ionosphere. These disturbances would play a key role in the energy coupling between the magnetosphere and the ionosphere. The purpose of this study is to obtain the polar distributions of these small-scale disturbances and their contributions to field-aligned currents from the Akebono magnetometer data. We analyzed the magnetometer data of 2596 passes in 1991 during the periods when the Akebono satellite was located above an altitude of 5000 km with the FFT method. The obtained polar maps show that the region of intense magnetic disturbances in the frequency range 0.0156-0.125 Hz covers the local time sector from the dayside cusp to the dawnside. In contrast, no intense disturbances are found on the nightside and duskside region. It is also found that in the altitude region from 5000 to 8000 km intense magnetic disturbances are observed over a wide latitude range from the auroral oval to the polar cap, while in the altitude region above 8000 km, these disturbances are concentrated in the dayside cusp region and its vicinity. We will discuss the origins of such day-night and dawn-dusk asymmetry and altitude dependency.

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