Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..06h&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA21A-06
Physics
2411 Electric Fields (2712), 2427 Ionosphere/Atmosphere Interactions (0335), 2443 Midlatitude Ionosphere, 2778 Ring Current
Scientific paper
We will report the observations of a sharp ionospheric plasma velocity reversal boundary at subauroral latitudes during magnetic storms in the midnight-dawn sector. The zonal plasma drift was eastward poleward of the velocity boundary and became westward equatorward of the boundary. The latitudinal extent of the westward drifts was \sim20 degrees. A local maximum of the drift occurred only 2-5 deg below the boundary; the magnitude of the maximum velocity was 200-400 m/s between 21 and 03 local time (LT) and as high as 780 m/s near midnight. The large westward plasma drift immediately equatorward of the velocity boundary first occurred at 21 LT and continuously extended across midnight to the dawn sector. The location of the maximum velocity coincided with the minimum density within the midlatitude ionospheric trough. The latitude of the velocity boundary decreased from geographic latitude \sim53 to \sim43 degrees (corresponding to geomagnetic latitude ~65 to ~55 degrees) between 21 and 08 LT. We propose that the large westward drift at subauroral latitudes is driven by the polarization jet electric fields in the ring current and that the lower-latitude westward drift with moderate magnitude is caused by the disturbance wind dynamo.
Foster Christopher J.
Holt John M.
Huang Chan Chun
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