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Spatial and temporal properties of AKR burst emission derived from Cluster WBD VLBI studies

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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https://hal.archives-ouvertes.fr/hal-00317536
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Submitted on : Wednesday, July 14, 2004 - 8:00:00 AM
Last modification on : Monday, July 16, 2018 - 6:36:03 PM
Long-term archiving on: : Thursday, June 3, 2010 - 7:17:19 PM

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R. L. Mutel, D. A. Gurnett, I. W. Christopher. Spatial and temporal properties of AKR burst emission derived from Cluster WBD VLBI studies. Annales Geophysicae, European Geosciences Union, 2004, 22 (7), pp.2625-2632. ⟨hal-00317536⟩

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