THEMIS FTE Encounter Between Oppositely Directed Reconnection Jets at the Dayside Subsolar Region on 27 June 2007

Details THEMIS FTE Encounter Between Oppositely Directed Reconnection Jets at the Dayside Subsolar Region on 27 June 2007 THEMIS FTE Encounter Between Oppositely Directed Reconnection Jets at the Dayside Subsolar Region on 27 June 2007

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm23b..04e&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM23B-04

Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [2724] Magnetospheric Physics / Magnetopause And Boundary Layers

Scientific paper

We report a strong 90 nT core field FTE observed by three THEMIS probes (C,D,E) within (E) and adjacent to (C,D) the subsolar magnetopause boundary layer at 0450:30 UT on 27 June 2007 when the TH-E GSM position was (10.22, 1.03, -2.63) Re. TH-E first observed a northward (Vz>0) jet before encountering a negative-then-positive bipolar BN field deflection followed by a southward (Vz<0) jet. The joint Vz and BN signatures are consistent with two X-lines present to the south (Vz>0) and north (Vz<0) of a southward moving FTE rather than a single northward moving X-line. The total (PB+PP) FTE pressure was dominated by the core magnetic field which was 1.5 times stronger than the magnitude of the dayside geomagnetic field. TH-B monitored a relatively steady IMF (Bx,By,Bz)=(-4.4,-11.8,-30.5) nT in the magnetosheath just 0.7 Re away from TH-D. An MHD reconstruction of the TH-E data confirms the presence of the FTE and its southward (58 km/s) motion. It also indicates that the opposite exhaust flows are diverted around the FTE in the deHoffmann-Teller frame of the FTE. TH-C and TH-D measurements are reasonably well predicted by the reconstruction. The axial (-0.33,-0.94,0.07) GSM orientation of the reconstructed FTE is only 7 deg away from an estimated X-line orientation at half the average -158 deg IMF clock angle that TH-B recorded.

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