Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm33a1550s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM33A-1550
Physics
[2407] Ionosphere / Auroral Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [2463] Ionosphere / Plasma Convection, [2467] Ionosphere / Plasma Temperature And Density
Scientific paper
On 20-Dec-1998, the EISCAT Svalbard Radar was running in field-aligned mode from 0600-1200 UT. The auroral arc was observed by meridian scanning photometer to move from equatorward of the radar beam to poleward and back again while the radar was running, allowing measurements of the neutral temperature while the radar was measuring on closed field lines. When the auroral arc moved equatorward across the beam, 50 minutes of heating events were observed. Ion upflow is seen near all optical events, but only some show strong ion heating. Using the measured neutral temperature it is possible to estimate the scalar difference between the neutral wind and ion drift, assuming that frictional heating is the dominant ion heating mechanism. The strongest heating events do not appear to coincide spatially with optical events, rather they occur north or south of an optical event. This indicates that the heating events are caused by joule heating from reconnection-related transient flow channels.
Carlson Herbert C.
Moen Joran
Skjæveland
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