An algorithm to estimate flux tube volume and entropy parameter for non-zero dipole tilt

Details An algorithm to estimate flux tube volume and entropy parameter for non-zero dipole tilt An algorithm to estimate flux tube volume and entropy parameter for non-zero dipole tilt

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31a1508z&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM31A-1508

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2753] Magnetospheric Physics / Numerical Modeling, [2764] Magnetospheric Physics / Plasma Sheet

Scientific paper

The entropy parameter PV5/3 plays a critical role in the theory of magnetospheric plasma transport. For example, it is known that regions where the entropy decreases tailward tend to be interchange unstable, resulting in earthward flowing bursts (bubbles) that inject plasma into the inner magnetosphere. In situ measurement of the flux tube volume V remains largely impractical, which impedes our further understanding on the role of entropy parameter in plasma sheet dynamics. To address this, Wolf et al [2006] presented an approach for estimating flux tube volumes and corresponding entropy parameters using single-spacecraft measurements. Their algorithm is based on the assumption of equilibrium and north-south symmetry in the tail. In this study, we present an approach to test and generalize the Wolf formula when the tilt of the Earth’s dipole and various IMF configurations are taken into account. Our approach will use a newly developed version of a magnetospheric equilibrium code that includes the effects of non-zero dipole tilt and IMF By.

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