Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41b1853a&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41B-1853
Physics
[2407] Ionosphere / Auroral Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions
Scientific paper
Interactions between the plasma and neutral components of the upper atmosphere result in a diverse set of phenomena that occur over a wide range of spatial and temporal scales. Investigating these interactions requires essentially simultaneous measurements of (spatially resolved) ion and neutral parameters at a time resolution comparable to the time-scales of the underlying driving forces. Two instruments that are ideally suited to such investigations are the Scanning Doppler Imager (SDI) and the Advanced Modular Incoherent Scatter Radar (AMISR). The SDI is capable of resolving small-scale neutral horizontal flow structures and temperature fields across a wide field-of-view, with a temporal resolution of around 4 minutes. The AMISR allows for 'volumetric' ionospheric imaging by sampling along multiple range resolved beams simultaneously, with integration times at least comparable to the SDI. Here we present initial results from a campaign of coordinated observations between an AMISR and SDI located at Poker Flat Research Range in Alaska. This study focuses on the observed signatures of ion-neutral coupling at E and F-region altitudes, in particular the directly measured local ion-neutral velocity difference (required for calculating frictional heating rates) and estimates of the ion-neutral collision frequency from measurements taken along the local geomagnetic field-aligned direction. These observations are placed in the context of the large-scale neutral and ion flows.
Anderson Christian
Conde M. G.
Kosch Mike
Nicolls Michael J.
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