Coordinated ESR-Reimei observations of the cusp ionosphere

Details Coordinated ESR-Reimei observations of the cusp ionosphere Coordinated ESR-Reimei observations of the cusp ionosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21c..05p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM21C-05

Physics

[2455] Ionosphere / Particle Precipitation, [2467] Ionosphere / Plasma Temperature And Density, [2706] Magnetospheric Physics / Cusp, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

The polar cusp, being the region where the magnetosheath plasma has a direct access to the magnetosphere and the polar ionosphere, is an interesting region to study, not only to understand how the coupling between the solar wind and the magnetosphere works, but also because at its footprint, interesting ionospheric phenomena occur: complex local electrodynamics, particle heating and outflow, etc. To study those phenomena, we have selected a few Reimei satellite overflights of the EISCAT Svalbard Radar (ESR) in the cusp region. These conjunctions allow us to directly compare precipitating magnetosheath particles and their effects on the dayside polar ionosphere. We present preliminary results of two of those conjunctions. The first case is characterized by an unusually strong zonal convection speed measured by the ESR at 08:25 UT on September 28, 2007. This strong plasma flow is believed to increase the ion temperature through frictional heating with the neutrals and drive ion outflow. However, we do not allays see very high ion temperature in our case, suggesting that Joule heating is not the unique source of ion outflow. In the second case around 08:11 UT on October 18, 2007, the conjunction occurs when the ESR is at the equatorward boundary of the cusp. Yet, the soft-electron precipitation is rather weak and as well as the electron temperature measured by the ESR. An interesting feature is that the particle sensor onboard Reimei observes a discontinuous cusp that we explain by the changes in the IMF orientation (given by Themis).

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