Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21a1883m&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM21A-1883
Physics
Plasma Physics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2407] Ionosphere / Auroral Ionosphere, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
The broadband acceleration of auroral electrons has both been associated with ULF wave activity and shown statistically to increase in occurrence at substorm expansion phase onset. In this paper, we show that auroral and magnetic fluctuations immediately prior to auroral break-up are intimately related, possessing the same initiation time and location, and frequency content. We present specific case studies and statistics of the evolution of ground-based and in-situ magnetic wave power and ground-based auroral intensity throughout the late growth phase and expansion phase of the substorm cycle. We show strong evidence that some substorm-related auroral enhancements are clearly and demonstrably linked to the evolution of ULF wave power, whilst interestingly some auroral forms are not. We discuss the implications of these results with regards to the possible drivers of auroral acceleration in the magnetosphere.
Frey Harald U.
Mann Ian R.
Murphy Kyle R.
Rae Joe
Singer Howard J.
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