Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12b..05o&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM12B-05
Physics
2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2731 Magnetosphere: Outer, 7835 Magnetic Reconnection
Scientific paper
The cusp is the region in the high-latitude dayside magnetosphere where the magnetosheath plasma has direct access to the magnetosphere and ionosphere along open field lines. Because of this direct connection to the dayside magnetopause, the cusp is expected to vary temporally and spatially with changes in the rate and location of reconnection on the magnetopause. Indeed, variability of the cusp properties is commonly observed. An important challenge is to use the cusp observations to study the reconnection process; however, it is often difficult to determine if the observed cusp structure is due to spatial or temporal variations in magnetopause reconnection. In this presentation, we will review the basic properties of the cusp and describe the expected cusp structure resulting from temporally and spatially varying reconnection. Observational evidence for both types of variability will be shown, and the implications for reconnection structure and dynamics will be discussed.
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