Modeling the Structure of Magnetic Mirrors Using Cluster Data

Details Modeling the Structure of Magnetic Mirrors Using Cluster Data Modeling the Structure of Magnetic Mirrors Using Cluster Data

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11b0431c&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11B-0431

Physics

2728 Magnetosheath, 2752 Mhd Waves And Instabilities

Scientific paper

Magnetic mirror structures are common in space plasma where the temperature is anisotropic, in particular they can be often found in the terrestrial magnetosheath. Because of their ability to provide simultaneous measurements from points separated by distances of the order of the magnetic mirror dimensions the four Cluster spacecrafts constitute an adequate tool for the study of the geometrical structure of magnetic mirrors . In this work we present a method for the identification of magnetic mirrorstructures using Cluster magnetometer observations and a recently developed analytical model for magnetic mirrors. The model used here allows for very complex geometry of magnetic mirrors to be described. The structure is made up of many coaxial layers and only near the axis it has the well-known bottle shape. Because of this feature, multi-spacecraft measurements are necessary in the search of the magnetic mirrors. Once a mirror structure is identified, we can specify its location, orientation, shape and dimensions. The method we have used consists of two distinct steps. First we do a simultaneous fitting of the magnetic field data from two or more spacecrafts. Making use of the parameters obtained from the first step we compute the magnetic field predicted by the model at the locations of the remaining spacecrafts. The comparison between these results and the measured data decides if a mirror structure has been identified succesfully or not. Several magnetic mirrors have been found and their characteristics have been determined.

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