Cluster Multi-Spacecraft Observations of AKR in the Auroral Acceleration Region (Invited)

Details Cluster Multi-Spacecraft Observations of AKR in the Auroral Acceleration Region (Invited) Cluster Multi-Spacecraft Observations of AKR in the Auroral Acceleration Region (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51d..07c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51D-07

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

In winter 2009/2010 the four Cluster spacecraft studied the northern auroral acceleration region (AAR) for two months. The spacecraft traversed the region from its upper edges down to altitudes of less than 2500 km, at latitudes that tended to change only slowly during the passages. The separations of the spacecraft vary, but are on the order of 1000km. We present observations and analysis of auroral kilometric radiation (AKR) observed by the Wideband Data instruments on each spacecraft, which provide high time resolution waveforms in one of four distinct frequency bands: 0-77 kHz, 125-202 kHz, 250-327 kHz and 500-577 kHz. In several epochs, both Z- and X-mode AKR are simultaneously observed on some spacecraft, but not on others. The resulting spectral cutoffs and gaps, with their variances between spacecraft, provide insight into the generation and propagation of AKR in and near the AAR. Fine structure AKR is frequently seen simultaneously on multiple spacecraft as well, and here again spacecraft at different latitudes, local times and altitudes, in and near the acceleration region, show similarities and differences that also help us understand the behaviour of AKR in this region.

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