First radar measurements of ionospheric electric fields at sub-second temporal resolution

Details First radar measurements of ionospheric electric fields at sub-second temporal resolution First radar measurements of ionospheric electric fields at sub-second temporal resolution

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3503111g&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 3, CiteID L03111

Physics

2

Ionosphere: Instruments And Techniques, Radio Science: Signal Processing (0674), Ionosphere: Electric Fields (2712), Magnetospheric Physics: Substorms, Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836)

Scientific paper

A new multipulse sounding technique currently being used at the Wallops Island and Goose Bay SuperDARN radars has produced significant improvements in the temporal resolution of Doppler velocity measurements from which plasma velocities and electric fields are determined. The new technique allows Doppler velocities to be determined from every 200 ms multipulse sequence transmitted by the radar (equivalent to a 5 Hz measurement rate). To our knowledge, this is the highest Doppler measurement rate that has ever been attained with ionospheric radars. Tests of the new technique with the Wallops radar and Ottawa magnetometer revealed bursts of subauroral electric and magnetic field pulsations with periods of 13-20 s during a substorm expansion phase. These results indicate that SuperDARN measurements can be used to study highly dynamic processes in the coupled magnetosphere-ionosphere system, including storm and substorm electrodynamics, short-period pulsations and short-term variability in Joule heating.

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