Reconnection at the dayside low-latitude magnetopause and its nonrole in low-latitude boundary layer formation during northward interplanetary magnetic field

Details Reconnection at the dayside low-latitude magnetopause and its nonrole in low-latitude boundary layer formation during northward interplanetary magnetic field Reconnection at the dayside low-latitude magnetopause and its nonrole in low-latitude boundary layer formation during northward interplanetary magnetic field

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217101p&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 17, CiteID L17101

Physics

Plasma Physics

13

Magnetospheric Physics: Cusp, Magnetospheric Physics: Magnetopause And Boundary Layers, Solar Physics, Astrophysics, And Astronomy: Magnetic Reconnection (2723, 7835), Space Plasma Physics: Transport Processes

Scientific paper

On 2001-12-02 Wind crossed the dayside magnetopause (MP) at ~15 MLT and traversed the adjacent low-latitude boundary layer (LLBL) over a period of 2 hours. The IMF was steady (northward and dawnward) during the MP/LLBL encounter. Reconnection flows were observed in the MP that were directed 130° away from the magnetosheath flow direction. In contrast, the LLBL flow was aligned with the magnetosheath flow. The counterstreaming field-aligned and anti-field-aligned electrons have different energies and their fluxes are unbalanced in the open MP whereas they are precisely balanced throughout most of the LLBL indicative of a closed LLBL. These observations indicate that reconnection occurs at the low-latitude MP during northward IMF (with a significant By), but low-latitude reconnection is not responsible for the creation of the LLBL. Instead, reconnection appears to be in the process of eroding a pre-existing LLBL that was created either by diffusive entry or by non-simultaneous double-cusp reconnection.

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