Direct Determination of Auroral Kilomeric Radiation Burst Locations Using Cluster VLBI Delay Observations

Details Direct Determination of Auroral Kilomeric Radiation Burst Locations Using Cluster VLBI Delay Observations Direct Determination of Auroral Kilomeric Radiation Burst Locations Using Cluster VLBI Delay Observations

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21b..07m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM21B-07

Physics

2704 Auroral Phenomena (2407), 2731 Magnetosphere: Outer, 6924 Interferometry, 6994 Instruments And Techniques

Scientific paper

We have used the Wideband Data (WBD) instrument on Cluster to determine source locations of auroral kilometric radiation (AKR) bursts using multiple spacecraft in a very long baseline interferometry (VLBI) mode. The technique involves measuring the delays of AKR impulsive bursts on each of several independent baselines between pairs of spacecraft with sub-millisecond accuracy. The delays are combined to solve for source location by triangulation. The accuracy of the technique depends on the Cluster orientation and distance from Earth, but typical uncertainties are 200-1000 km in a plane perpendicular to the source-Cluster line of sight, and somewhat larger along this direction. We have analyzed AKR burst locations for more than 30 events, and have compared the derived positions with contemporaneous images of auroral taken by imagers on the POLAR and Image spacecraft. We find that the AKR locations are consistent with emission occurring at or near the local gyrofrequency, and the bursts tend to occur along magnetic field lines located above regions of bright regions in the auroral oval. These observations are the first direct 3-dimensional measurement of AKR source location. >http://denali.physics.uiowa.edu/rlm/research/vlbi-akr

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