On the Generation of Ionospheric Irregularities in the Dayside Polar Cap

Details On the Generation of Ionospheric Irregularities in the Dayside Polar Cap On the Generation of Ionospheric Irregularities in the Dayside Polar Cap

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33a1627o&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA33A-1627

Other

2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2463 Plasma Convection (2760), 2471 Plasma Waves And Instabilities (2772), 2475 Polar Cap Ionosphere

Scientific paper

In this paper we review recent work on the formation of ionospheric irregularities in the dayside polar cap. The last 6-7 years we have carried out several observational campaigns at the EISCAT Svalbard Radar to study polar cap patches and the local plasma flow in the F-region. A key discovery is the existence of Reversed Flow Events (RFEs), which are 100-200 km wide channels of intense flow that opposes the background convection. Here we discuss the role that these events have for the growth of ionospheric plasma irregularities. The cusp ionosphere is known to be a very efficient backscatter target for HF radars like SuperDARN. It has long been thought that the Gradient Drift Instability (GDI) is the primary mechanism behind the decameter size irregularities that these radars obtain their echoes from. But the newly discovered RFE channels open up the possibility that other mechanisms like the Kelvin Helmholtz Instability (KHI) can operate in conjunction with the GDI too. The effect is a more rapid and more efficient structuring of the F- region plasma as it enters the dayside polar cap. In this paper we present ground-based observations from both optical and radar techniques that support this new idea.

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