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Ann. Geophys., 22, 2625-2632, 2004
www.ann-geophys.net/22/2625/2004/
© European Geosciences Union 2004
Spatial and temporal properties of AKR burst emission derived from Cluster WBD VLBI studies
R. L. Mutel, D. A. Gurnett, and I. W. Christopher
University of Iowa, Iowa City IA 52242, USA
Abstract. We have determined the locations of over 6000 individual auroral kilometric
radiation (AKR) bursts between July 2002 and May 2003 using a very long
baseline interferometer (VLBI) array. Burst locations were determined by
triangulation using differential delays from cross-correlated Cluster WBD
waveforms. Typical position uncertainties are 200-400km in the plane
normal to the source-spacecraft line, but much larger along this line.
The AKR bursts are generally located above the auroral zone with a strong
preference for the evening sector (22:00 MLT±2h). However, a few
epochs imaged during the austral summer have loci in the daytime sector,
especially near 15:00 MLT. There is
marginal evidence for a small N-S hemispheric asymmetry in mean MLT and
invariant latitude.
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