Transient ion beamlet injections into spatially separated PSBL flux tubes observed by Cluster-CIS

Details Transient ion beamlet injections into spatially separated PSBL flux tubes observed by Cluster-CIS Transient ion beamlet injections into spatially separated PSBL flux tubes observed by Cluster-CIS

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112804k&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 12, CiteID L12804

Physics

12

Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Magnetosphere-Outer, Magnetospheric Physics: Magnetotail Boundary Layers

Scientific paper

Ion measurements from Cluster-CIS were used to characterize and interpret the signatures of PSBL energy-dispersed ions and their fine structure. On 14 February 2001, several ion injections were encountered by SC 1 and SC 3, separated by ~530 km, during an outbound orbit at 4.5 RE. Both satellites recorded the same ion structures. The energy dispersion of each ion structure was dominated by the time-of-flight effect (TDIS). In addition, we show evidence for spatial properties of the ion injections: (1) SC 1 and SC 3 encountered the same ion structures with a time delay of ~30 s, which indicates their spatial extent. (2) The peak energy of each injection increased with increasing latitude. We propose a scenario in which both temporal and spatial effects are incorporated: Ion beamlets are impulsively and recurrently injected from separated regions distributed along the tail current sheet (ranging from X ~70 to 110 RE) into latitudinally narrow (~600 km to 1800 km) and convecting (at ~10 km/s) flux tubes of the PSBL. Beamlets injected closer to the X line gain higher energies as a result of the intrinsic dispersion effect.

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