The Steepness of the Ridge of High Magnetic Shear Across the Dayside Magnetopause: Implications for the Location and Stability of the Reconnection X-line

Details The Steepness of the Ridge of High Magnetic Shear Across the Dayside Magnetopause: Implications for the Location and Stability of the Reconnection X-line The Steepness of the Ridge of High Magnetic Shear Across the Dayside Magnetopause: Implications for the Location and Stability of the Reconnection X-line

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23a2030p&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23A-2030

Physics

Plasma Physics

[2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2728] Magnetospheric Physics / Magnetosheath, [2799] Magnetospheric Physics / General Or Miscellaneous, [7835] Space Plasma Physics / Magnetic Reconnection

Scientific paper

Recent studies of cusp ion distribution velocity cutoffs during intervals of southward interplanetary magnetic field have led to the development of a model of dayside magnetopause reconnection which consists of a continuous x-line under certain conditions. This model is supported by in situ observations as spacecraft cross the magnetopause. In this model, the continuous x-line lies on the dayside magnetopause along a ridge of maximum magnetic shear angle, between the magnetosheath and magnetospheric magnetic field directions. In this study we examine the steepness of this ridge, as a function of the solar wind magnetic field clock angle, Bx/BTotal, dynamic pressure, and the Earth's dipole tilt angle. The steepness of this ridge is believed to play a role in the stability of the x-line location, and may even be an important factor for the likelihood of flux transfer event (FTE) occurrence. An analytic form for the continuous x-line itself as a function of the parameters described above is also investigated.

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