Local Time Distribution of Reconnected Field Lines Under Northward IMF Conditions: Implications for Populating the Low Latitude Boundary Layer

Details Local Time Distribution of Reconnected Field Lines Under Northward IMF Conditions: Implications for Populating the Low Latitude Boundary Layer Local Time Distribution of Reconnected Field Lines Under Northward IMF Conditions: Implications for Populating the Low Latitude Boundary Layer

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13b1216p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM13B-1216

Physics

7835 Magnetic Reconnection, 2724 Magnetopause, Cusp, And Boundary Layers, 2731 Magnetosphere: Outer, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Full 3D plasma observations in the northern cusp region are used to study the reconnection process and the in-flow of flux into the magnetosphere during intervals of northward IMF. Several intervals are examined for which He++ of solar wind origin appears simultaneously with counter-streaming O+ ions of ionospheric origin. The presence of He++ indicates that magnetic reconnection had recently occurred (opening the magnetosphere to the solar wind), while the counter-streaming O+ observations provides evidence that the magnetic field lines have once again closed. This implies that the magnetic field line has reconnected twice; once in one hemisphere (tailward of the cusp), and then a second time in the opposite hemisphere. The local time distribution of the occurrence of these events provides important information as to where and when magnetopause reconnection for northward IMF is likely to occur, and how solar wind plasma is brought into the low-latitude boundary layer of the outer magnetosphere. These locations are also compared with model predictions.

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