Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa21b0068b&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA21B-0068
Physics
2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2411 Electric Fields (2712), 6982 Tomography And Imaging
Scientific paper
A high latitude tomography array has been deployed and operated along the west coast of Greenland since September 2000. The array routinely produces two-dimensional images of electron density along the array axis. While two-dimensional images have tremendous value, in order to investigate the structure of conductances and currents a local three-dimensional analysis is necessary. We have recently developed a full three-dimensional space weather analysis algorithm called ionospheric data assimilation 3D (IDA3D). In addition to the tomographic data from the Greenland array, this algorithm ingests data from ground GPS, GPS occultations, ionosondes and DMSP measurements to compute the 3D electron density over the entire high latitude ionosphere. From the three-dimensional estimation of electron density, local estimations of conductances can be derived. By combining the IDA3D estimation of conductances with convection velocities measurements from SuperDARN and magnetometer measurements we are able to investigate the local three-dimensional structure of current density over Greenland. We present an analysis of the local Greenland current density structure. The analysis includes combining IDA3D derived conductances with SuperDARN convection velocity measurements to obtain currents, which can then be compared with equivalent currents obtained from magnetometer data. Conversely, magnetometer estimates of equivalent currents can be combined with IDA3D conductances and compared with SuperDARN convection velocities. Results are presented for several days analysis in winter of 2001.
Bust Gary S.
Garner T. W.
Gaussiran Thomas L.
Murr David Lee
Shepherd S.
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