Observations of auroral acceleration at magnetically conjugate spacecraft: A Cluster case study (Invited)

Details Observations of auroral acceleration at magnetically conjugate spacecraft: A Cluster case study (Invited) Observations of auroral acceleration at magnetically conjugate spacecraft: A Cluster case study (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51d..06f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51D-06

Physics

Plasma Physics

[2455] Ionosphere / Particle Precipitation, [2704] Magnetospheric Physics / Auroral Phenomena, [2712] Magnetospheric Physics / Electric Fields, [7845] Space Plasma Physics / Particle Acceleration

Scientific paper

On the 14th December 2009, Cluster passed through an auroral acceleration region (AAR) at an altitude of 4400-5900 km. Cluster 4 passed through the AAR at 4450 km, 2.5 minutes prior to Cluster 1 and Cluster 3. The spacecraft observed various signatures of the AAR: low energy ion conics, inverted-V electron distributions, field-aligned currents and narrow beams of heavy ions. During their crossing, Cluster 1 and Cluster 3 were magnetically conjugate, separate by 1500 km. The multi-spacecraft nature of this encounter facilitates the determination of the spatially averaged electric field within and below the AAR along with the field-aligned currents. The spatially averaged electric fields between the Cluster 1 and Cluster 3 and between Cluster 3 and the ionosphere are found to be comparable. We aim to compare these spatial, temporal and in-situ measurements to give a more complete picture of the processes within the AAR.

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