Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41b1852g&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41B-1852
Physics
[2400] Ionosphere, [2411] Ionosphere / Electric Fields, [2441] Ionosphere / Ionospheric Storms, [2494] Ionosphere / Instruments And Techniques
Scientific paper
North-South and East-West components of the auroral-zone electric field have been measured with the incoherent-scatter radar at Poker-Flat, Alaska. The phased-array technology incorporated with the radar system provides a new method to determine electric fields as a function of latitude with minimal spatial and temporal ambiguity. Successive radar pulses are transmitted in thirteen antenna directions. Doppler data are combined and integrated to determine electric field values from 66 to 68 degrees latitude in 0.25 degree steps. Data periods have been selected when substorm currents, as detected from the Alaskan magnetometer chain, are within range of the radar. Specific events near the onset of magnetic substorms have been examined to determine average variations of the electric field with respect to substorm onset time. The northward component of the field is typically about 20-30mV/m in the evening and transitions to values near zero about one hour before substorm onset (we identify this period as the substorm growth phase) and then adopts southward values about 20-30mV/m at the time of substorm onset. The east-west component values of the electric field are near zero in the evening, and then go to about 10mV/m directed westward during the growth phase and after substorm onset.
Gudivada K.
Watkins Brenton
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