A mechanism for the formation of plasma patches in the high-latitude ionosphere1

Details A mechanism for the formation of plasma patches in the high-latitude ionosphere1 A mechanism for the formation of plasma patches in the high-latitude ionosphere1

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa51a0243g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA51A-0243

Physics

2437 Ionospheric Dynamics, 2463 Plasma Convection (2760), 2475 Polar Cap Ionosphere

Scientific paper

One of the important features of the high-latitude ionospheric plasma is the occurrence of plasma patches. Statistical studies of their size distribution indicates that plasma patches are typically 300-400 Kms in extent and have density enhancements of at least a factor of two compared to the background density. We present results on 2D and 3D simulations addressing the issue of structuring of a large tongue-of-ionization which enters the polar region through the cusp. The dissipative Kelvin-Helmholtz instability in the localized anti-sunward flow of the two-cell convection pattern for southward IMF provides a natural mechanism for the creation of structures comparable to the width of the flow channel. This can provide one possible explanation of the occurrence of patches in the high-latitude ionosphere. 1 Work supported by NSF

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