Striated drifting auroral kilometric radiation bursts: Possible stimulation by upward traveling EMIC waves

We investigate waves observed by the Cluster wideband instrument (WBD) during an orbital conjunction with the Polar spacecraft. During this perigee pass, Polar was at the upper extent of the auroral kilometric radiation (AKR) source region in the Southern Hemisphere nightside auroral region. Cluster...

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Bibliographic Details
Published in:Journal of Geophysical Research. A. Space Physics 2006-04, Vol.111 (A4), p.n/a
Main Authors: Menietti, J. D., Mutel, R. L., Santolik, O., Scudder, J. D., Christopher, I. W., Cook, J. M.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
plasma waves and instabilities
wave/particle interactions
wave/wave interactions
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Summary:We investigate waves observed by the Cluster wideband instrument (WBD) during an orbital conjunction with the Polar spacecraft. During this perigee pass, Polar was at the upper extent of the auroral kilometric radiation (AKR) source region in the Southern Hemisphere nightside auroral region. Cluster was located at higher altitude above this region and observed AKR with clear signatures of ordered fine structure striations (rain). Using electron particle data observed by HYDRA on board Polar, we have modeled the electron distribution function within the AKR source region. This distribution function is unstable to a number of low‐frequency wave modes and supports EMIC waves propagating along the magnetic field line. These waves appear to be feasible to stimulate the growth of AKR, producing the ordered fine structure observed by WBD on board Cluster, but further analysis will be important, especially plasma simulations.
ISSN:0148-0227
2156-2202
DOI:10.1029/2005JA011339