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Simultaneous Cluster and CUTLASS observations of FTEs on 11 February 2004

Zhang, QH; Liu, RY; Huang, JY; Dunlop, MW; Hu, HQ; Hu, ZJ; ... Lester, M; + view all (2008) Simultaneous Cluster and CUTLASS observations of FTEs on 11 February 2004. CHINESE J GEOPHYS-CH , 51 (1) 1 - 9.

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Abstract

This paper analyzed the observations of the FGM and PEACE on Cluster spacecraft, and the CUTLASS Finland radar between 11 : 00 and 11 : 40 UT on 11 February 2004. In this interval, the Cluster spacecraft array was encountering the northern hemisphere, high altitude cusp, and crossing the magnetopause into the magnetosheath at about 11 : 18 UT. A large number of flux transfer events (FTEs) were observed by all 4 Cluster spacecraft. It is found that these FTEs appeared quasi-periodically with a period of about 130 s. Since all 4 Cluster spacecraft observed these FTEs, we applied the four-spacecraft techniques "Minimum Directional Derivative (or Difference)" (MDD) and "Spatio-temporal Difference " (STD) to calculate the dimension, motion and scale of these FTEs. The inferred northwardly reconnected flux tubes for these FrEs are shown to move northward or north-east and tailward with a quasi-2-D structure and a scale of (0.87 similar to 1.81) R-E. The ionospheric footprint of the Cluster spacecraft during the boundary passage is shown to map centrally within the field-of-view of the CUTLASS Finland radar. It is shown that the backscatter power of CUTLASS data enhanced in synchrony with the magnetospheric FTEs at the latitude of the Cluster footprint. These radar auroral features subsequently propagated poleward, forming classic "poleward-moving radar auroral form" structures at higher latitudes. Whilst, the FTE motions are shown to be consistent with the expected motion of reconnected magnetic flux tubes over the surface of the magnetopause, arising from a predominantly sub-solar reconnection site during the prevailing upstream. conditions.

Type:Article
Title:Simultaneous Cluster and CUTLASS observations of FTEs on 11 February 2004
Keywords:magnetic reconnection, FTEs, poleward-moving radar auroral form, cooling model, FLUX-TRANSFER EVENTS, HIGH-LATITUDE MAGNETOPAUSE, MAGNETIC-FIELD, IONOSPHERE, MAGNETOSPHERE, MAGNETOSHEATH, RECONNECTION, SPACECRAFT, SIGNATURES, ELECTRON
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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