Origins of plasma sheet By

Details Origins of plasma sheet By Origins of plasma sheet By

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11607217p&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A7, CiteID A07217

Physics

1

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

With 11 years of Geotail measurements we analyzed sources of plasma sheet By and constructed a model, depending on IMF By, coordinates X, Y, and geodipole tilt angle. By dependence on dipole tilt due to the neutral sheet warping and hinging has an odd (antisymmetric) profile with respect to Y. In addition, a new, even with respect to Y, By component was discovered, which is positively correlated with dipole tilt with the maximal amplitude ±1-2 nT. In the postmidnight sector the dipole tilt effects in By almost cancel each other, while at the premidnight sector they are summed up and are comparable with the IMF penetration. Such season-dependent net By creates a principal azimuthal asymmetry of the magnetotail and is consistent with some polar convection and aurora observations. Plasma sheet By is often substantially larger than the statistically expected value. This effect can be understood as “amplification” due to internal plasma sheet dynamics. As a result an asymmetric tail of the By distribution forms, causing certain overestimation of the regression coefficients in statistical models.

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