What are the causes of the formation of the sub-Alfvenic flows at the high latitude magnetopause?

Details What are the causes of the formation of the sub-Alfvenic flows at the high latitude magnetopause? What are the causes of the formation of the sub-Alfvenic flows at the high latitude magnetopause?

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm52b0589a&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM52B-0589

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We study magnetopause crossings made by the Interball Tail spacecraft at high latitudes under various interplanetary conditions. When the IMF is mostly northward the Interball Tail observes quasi steady state reconnection signatures at the high latitude magnetopause, which include a well-defined de Hoffman-Teller frame, satisfaction of stress balance (Walen relations) and D-shaped ion velocity distributions. Under variable or southward IMF the high latitude magnetopause is a tangentional discontinuity. However, in certain conditions, just after the magnetopause crossing, irrespective of the IMF orientation, decelerated magnetosheath flows are observed in the magnetosheath region adjacent to the high latitude magnetopause. This leads to formation of the region where the sub-Alfvenic flow at high latitudes exists. We suggest that in some cases the dipole tilt plays an important role in the formation of the sub-Alfvenic flows, although in some cases formation of the depletion layer is responsible for observation of the sub-Alfvenic flows at the high latitude magnetopause.

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