A Comparison of Terrestrial and Kronian CMI growth rates

Details A Comparison of Terrestrial and Kronian CMI growth rates A Comparison of Terrestrial and Kronian CMI growth rates

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1386m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1386

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2753] Magnetospheric Physics / Numerical Modeling, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

The Earth's auroral kilometric radiation (AKR) and Saturn's SKR are both thought to be driven by the electron cyclotron maser instability (CMI) mechanism. Recent in situ measurements of AKR intensities and electron distributions using Cluster WBD and PEACE instruments in the auroral acceleration region are compared with CMI growth rates to determine whether the distribution can account for the observed intensities. We compare these results to a similar coeval measurement of SKR intensities and electron distribution functions in the Kronian acceleration region using the RPWS and CAPS/EWS instruments. The terrestrial AKR appears to be driven by perpendicular velocity gradients, while the Kronian SKR is driven by parallel gradients resulting from a very intense, slightly spread parallel beam with a sharp low-energy edge. The measured k-vector orientations are also consistent with the dominance of the differing terms in the growth rate integral (significant parallel k-component in Kronian case). Kronian electron velocity distribution function showing strong parallel beam. This beam appears to drive the CMI instability.

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