North-South IMF and a magnetosheath flow effect on the magnetic field line draping pattern in the dayside magnetosheath.

Details North-South IMF and a magnetosheath flow effect on the magnetic field line draping pattern in the dayside magnetosheath. North-South IMF and a magnetosheath flow effect on the magnetic field line draping pattern in the dayside magnetosheath.

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm43c1235l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM43C-1235

Physics

2728 Magnetosheath

Scientific paper

Orientations of the observed magnetic field in the dayside magnetosheath are compared with the predicted field line-draping pattern from the Köbel-Flucklinger model. We present histogram distributions which describe the deviations between the actual and model predicted magnetosheath magnetic field clock angle for different magnetosheath cross-sections under northwards, southwards and equatorial IMF. In some sections of the magnetosheath, a broadening of the distribution is observed in conjunction with strongly northwards and southwards IMF which is evidence that reconnection strongly influences the draping pattern. When this is the case the accuracy of the model prescription for magnetosheath clock angle is poor. Furthermore, a consistent rotation of the overall draping pattern with respect to the model prediction is found. The sense of rotation is understood in terms of a twisting of the magnetic field lines by the magnetosheath plasma flow. We show that reconnection and the bulk flow direction of the plasma strongly influence draping in the dayside magnetosheath.

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