High Speed Stream Activity in an IMF-By magnetosphere (Invited)

Details High Speed Stream Activity in an IMF-By magnetosphere (Invited) High Speed Stream Activity in an IMF-By magnetosphere (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm24a..03k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM24A-03

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

A simulation of the 22-24 January 2005 high speed stream interval under obliquely southward IMF conditions compared to a variety of magnetospheric and ionospheric observations shows new features not previously associated with high speed streams, including capture of magnetosheath plasma on the dayside and field-aligned currents associated with weak field regions in the magnetotail. Magnetosheath plasma is captured on the dayside as a result of opening and then re-closing overdraped magnetospheric field lines. There is evidence that a portion of the cusp/cleft is on closed field lines and that ring current ions are being re-circulated within the magnetosphere through the cusp and mantle. A dayside peak in energetic neutral atoms (ENA) is observed throughout the three days of the event, which may be related to scattering of high-energy ions in the weak fields near the dayside cusp. On the nightside, high-energy particle injections at geosynchronous orbit are associated with peaks in solar wind Ey and thus bursts of magnetospheric convection. These injections coincide with auroral activity resembling poleward boundary intensifications in many respects rather than the recurrent substorms normally thought to be associated with high-speed stream activity. Dipole tilt variations over the day give the geosynchronous injections and auroral activity a recurrent UT-dependence. These new phenomena suggest that high-speed streams drive a continuum of magnetic activity in which features depend on the orientation and IMF bias of a particular stream. TWINS observations of newly discovered features under conditions of large IMF By will be presented.

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