High Latitude M-I Coupling during the Current Solar Minimum: Observations with PFISR

Details High Latitude M-I Coupling during the Current Solar Minimum: Observations with PFISR High Latitude M-I Coupling during the Current Solar Minimum: Observations with PFISR

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31b1417n&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA31B-1417

Physics

[2407] Ionosphere / Auroral Ionosphere, [2494] Ionosphere / Instruments And Techniques, [2704] Magnetospheric Physics / Auroral Phenomena, [7949] Space Weather / Ionospheric Storms

Scientific paper

Since August of 2007, initially as part of the International Polar Year (IPY) campaign, the Poker Flat Incoherent Scatter Radar (invariant latitude of ~66 degrees) has been operating almost continuously in an observational mode suitable for the determination of ionospheric parameters, including electric fields and conductivities. Two prevalent features of this dataset have been linked to M-I coupling mechanisms. The first is associated with the dominant source of recurrent geomagnetic activity during this solar minimum: the passage of coronal hole, fast streams by the Earth, associated with the solar wind corotating interaction region (CIR). The episodic high latitude energy input leads to Joule heating and distinct ion temperature enhancements. Electric field and Joule heating results will be presented in an effort to understand the energy deposition into the ionospheric-thermospheric system. The second occurs during periods of quiet geomagnetic activity and has properties indicative of Sub-Auroral Polarization Streams (SAPS), wherein enhanced ionospheric westward convection is observed in the low conductivity region to the south of the diffuse aurora. The convection enhancements are frequently followed by enhanced ionization/conductivity as the plasma sheet electron precipitation (diffuse aurora) penetrates equatorward, in agreement with the observations reported by Lyons et al. [JASTP, 2009]. The sources of the convection enhancements as well as the characteristic properties of the events are investigated.

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