Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm14a..07n&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM14A-07
Physics
[2475] Ionosphere / Polar Cap Ionosphere, [2494] Ionosphere / Instruments And Techniques, [2706] Magnetospheric Physics / Cusp, [2776] Magnetospheric Physics / Polar Cap Phenomena
Scientific paper
The first measurements from the northward-looking Resolute Bay Incoherent Scatter Radar (RISR-N) reveal interesting features within the deep polar cap. Electrodynamically, the observations of the polar ionospheric F region show the fine control of the ionospheric plasma density and flow (electric field) by the solar wind interplanetary magnetic field (IMF). We find that density enhancements are strongly tied to strong IMF Bz southward turnings, arriving 25-75 minutes (depending on the magnetic local time) after the IMF pulse arrives at the bowshock nose and lasting as long as Bz stays southward. These patches are altitudinally smooth, a characteristic of solar-produced plasma, yet contain as small as 25 km horizontal substructures. Convection responds by anti-sunward intensification within 25 minutes of Bz-southward turnings. In addition to plasma density and drifts, the incoherent scatter measurements reveal interesting spectral characteristics that we postulate can likely only be explained by a second population of downward-streaming O+ ions in the polar cap F region. These downward fluxes likely relate to cusp outflow dynamics. In this talk, we discuss the system deployment and specifications, these initial results, and areas of ongoing and future research.
Bahcivan Hasan
Heinselman Craig J.
Nicolls Michael J.
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