Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa51a03e&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA51A-03
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2463 Plasma Convection
Scientific paper
During disturbed conditions, sub-auroral latitudes can experience large polarization electric fields which result in a characteristic double-peaked sunward convection, accompanied by latitudinally narrow sub-auroral ion drifts (SAIDs). The polarization jet electric fields are observed to become highly structured in latitude, and exhibit significant spatial and temporal variability which require fine-scale resolution techniques. We present detailed observations of polarization jet electric field structure using coherent backscatter observations from the Millstone Hill 440 MHz UHF radar system during a moderately disturbed period (Kp = 5) on November 13, 1998. We use a combination of data obtained at high time (< 0.5 second) and spatial (3 km range) resolution and radar response modelling to investigate the structure of Farley-Buneman two-stream irregularities during several intense SAID events. These radar observations provide a unique view of the spatial and temporal variation of the intense sub-auroral electric field in the SAID / polarization jet region. We observe sharp electric field gradients of more than 4 mV/m per degree latitude, superimposed on a polarization jet with a maximum of > 70 mV/m amplitude spanning 3 degrees of latitude. The polarization jet / SAID structure moves northward at a rate of 200 - 300 m/s during our observations. Simultaneous DMSP satellite cross-track drift data taken to the east of Millstone Hill confirm our interpretation of the radar results and place the observed electric field structure in context with electron and ion precipitation edges and poleward auroral convection.
Erickson Phil J.
Foster Christopher J.
Rich Frederic J.
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