Imaging Radar Observations of the Auroral Electrojet During the JOULE Campaign.

Details Imaging Radar Observations of the Auroral Electrojet During the JOULE Campaign. Imaging Radar Observations of the Auroral Electrojet During the JOULE Campaign.

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa21c..06h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA21C-06

Physics

0674 Signal Processing And Adaptive Antennas, 2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712), 2439 Ionospheric Irregularities

Scientific paper

We have used aperture synthesis imaging techniques to observe the radar aurora with a 30 MHz radar from Anchorage, Alaska during the JOULE campaign. Radar imaging allows us to sort the echoes into bearing as well as in range and Doppler bins. Because of the high radar PRF and low radar frequency, the echoes we observed, both type 1 and type 2, were underspread, and the data therefore suffer no range, Doppler, or bearing ambiguities. The radar range and azimuth resolution was 2.5 km and about 0.4o, respectively, during our observations. We observed type 1 and type 2 echoes with Doppler shifts that varied rapidly and sometimes discontinuously with range and azimuth (and time), suggesting fine structure in the electric field on the scale of the radar resolution. Using regularization methods, it should be possible to infer the convection pattern in the volume illuminated by the radar and to calculate the contribution to the overall Joule heating rate from the fine structure. It will also be possible to make direct comparisons between the electric fields and winds measured in situ and the Doppler spectra measured by the radar for the first time.

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