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Titel Observations of auroral acceleration at magnetically conjugate spacecraft: A Cluster case study
VerfasserIn Colin Forsyth, Andrew Fazakerley, Andrew Walsh, Clare Watt, Kristian Garza, Christopher Owen
Konferenz EGU General Assembly 2011
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 13 (2011)
Datensatznummer 250056736
 
Zusammenfassung
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, separated by 1500 km. The multi-spacecraft nature of this encounter facilitates the determination of the spatially averaged electric field within the AAR along with the field-aligned currents. The spatially averaged parallel electric field between Cluster 1 and Cluster 3 was 0.3-0.5 mV/m in the upward current region and represented over 10% of the total parallel potential in the AAR. We discuss whether this acceleration is due to an unobserved mid-cavity double layer or a spatially extended low-level electric field.