Tracing ions in the cusp and low-latitude boundary layer using multispacecraft observations and a global MHD simulation

Details Tracing ions in the cusp and low-latitude boundary layer using multispacecraft observations and a global MHD simulation Tracing ions in the cusp and low-latitude boundary layer using multispacecraft observations and a global MHD simulation

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1226f&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A9, pp. SMP 2-1, CiteID 1226, DOI 10.1029/2001JA000130

Physics

Plasma Physics

8

Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Numerical Modeling, Space Plasma Physics: Magnetic Reconnection, Interplanetary Physics: Planetary Bow Shocks

Scientific paper

High-latitude observations from the Polar spacecraft on 21 January 1998 show a region of closed magnetic field lines containing several distinct solar wind ion populations in the energy range from <10 eV to >200 keV e-1. Precipitating ion fluxes in this region are consistent with the low-latitude boundary layer (LLBL). A global MHD simulation of this event (using input from the Wind spacecraft upstream from the Earth's bow shock) reproduces Geotail and Interball/Tail spacecraft observations in the outer magnetosphere and magnetosheath. These results demonstrate that the simulation faithfully reproduces the global magnetic field configuration of the magnetosheath and magnetosphere and provides confidence for the interpretation of the LLBL observations from Polar. Results from the simulation show that a single evolutionary process of plasma entry into the cusp and evolution to the LLBL can account for the development of a multi-energy ion population of solar wind origin on closed magnetic field lines in the magnetosphere. Sources with direct access to the ultimately closed LLBL field lines observed by Polar are the dayside magnetosheath (low-energy ions below 3 keV e-1), the quasi-parallel bow shock (higher-energy ions between 3 and 100 keV e-1), and possibly the duskside magnetopause (highest-energy ions above 100 keV e-1).

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