Recent Plasma Observations Related to Dayside Magnetic Merging and the Low-Latitude Boundary Layer

Details Recent Plasma Observations Related to Dayside Magnetic Merging and the Low-Latitude Boundary Layer Recent Plasma Observations Related to Dayside Magnetic Merging and the Low-Latitude Boundary Layer

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh44a1706c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH44A-1706

Physics

2723 Magnetic Reconnection (7526, 7835), 7513 Coronal Mass Ejections (2101), 7519 Flares, 7831 Laboratory Studies And Experimental Techniques, 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

We have begun an investigation of the nature of the low-latitude boundary layer in the mid-altitude cusp region using data from the Polar spacecraft. This region has been routinely sampled for about three months each year for the periods 1999-2001 and 2004-2006. The low-to-mid-energy ion instruments frequently observed dense, magnetosheath-like plasma deep (in terms of distance from the magnetopause and in invariant latitude) in the magnetosphere. One such case, taken during a period of northward interplanetary magnetic field (IMF), shows magnetosheath ions within the magnetosphere with velocity distributions resulting from two separate merging sites along the same field lines. Cold ionospheric ions were also observed counterstreaming along the field lines, evidence that these field lines were closed. These results are consistent with the hypothesis that double merging can produce closed field lines populated by solar wind plasma. Through the use of individual cases such as this and statistical studies of a braoder database we seek to understand the morphology of the LLBL as it projects from the sub-solar region into the cusp. We will present preliminary results of our ongoing study.

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