Amplitude distribution of small-scale magnetic fluctuations over the polar ionosphere observed by Magsat

Details Amplitude distribution of small-scale magnetic fluctuations over the polar ionosphere observed by Magsat Amplitude distribution of small-scale magnetic fluctuations over the polar ionosphere observed by Magsat

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012335i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 1, 1985, p. 12,335-12,339.

Physics

3

Amplitude Distribution Analysis, Geomagnetism, Ionospheric Currents, Magnetic Variations, Magsat Satellites, Polar Regions, Birkeland Currents, Interplanetary Magnetic Fields, Ionospheric Conductivity, Latitude, Magnetospheric Instability

Scientific paper

Small-scale (between 1 and 35 km) or short time scale (between 0.12 and 5.0s) magnetic fluctuations observed by Magsat over the polar ionosphere were analyzed statistically. On the dayside, the maximum of the amplitude distribution appears near the poleward edge of the large-scale Birkeland current region 1, or at a latitude poleward of it. The amplitude strongly depends on the ionospheric conductivity and varies by a factor of 3 or more even at the same conditions of geomagnetic activity, sa uggesting that the fluctuations are generated mainly by small-scale Birkeland currents rather than Alfven waves. The interplanetary magnetic field (IMF) By causes the dawn-dusk asymmetry of the amplitude, and the IMF Bz component controls the latitudinal distribution of the fluctuations. On the nightside, the amplitude depends on geomagnetic activity, and the most active region roughly corresponds to the middle of the large-scale Birkeland current region. On both sides, the latitude of the maximum of the amplitude distribution roughly corresponds to that of the large-scale magnetospheric convection reversal, suggesting that the small-scale fluctuations are generated at the strong convection shear.

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