Tensor nature of the gas pressure and measurements of the polytropic indices for magnetic clouds: A case study

Details Tensor nature of the gas pressure and measurements of the polytropic indices for magnetic clouds: A case study Tensor nature of the gas pressure and measurements of the polytropic indices for magnetic clouds: A case study

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..499f&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 499-502 (1999).

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Interplanetary Magnetic Fields

Scientific paper

For the magnetic cloud observed on March 19-20, 1980 we discuss the applicability of a simple bipolytropic approximation in which P⊥,e≠P∥,e and T∥,e and T⊥,e are both related to the electron density ne through power laws. We find that (a) the magnetic cloud most likely consists of two flux tubes, in each of which a polytropic relation holds for both components of the electron temperature; (b) these relations are different for the parallel and perpendicular components, but both γ⊥,e and γ∥,e are < 1; (c) for the first tube, where the linear regression results are very accurate, we have γ⊥,e=0.64, γ∥,e=0.50 for the second tube γ⊥,e=0.47, γ∥,e=0.29 (d) the correlation coefficients in these relations (~ -0.96 and -0.85, respectively) are substantially higher than those obtained from the scalar values in the first tube, and comparable in the second; (e) changes in magnetic cloud topology coincide with changes in the polytropic relation. If these simple relations are confirmed by other examples, they would allow further theoretical studies of the dynamics and stability of the plasma in magnetic clouds. From a broader astrophysical context, our results are consistent with Scudder's (1) suggestion that non-Maxwellian plasmas may carry polytropic indices below unity.

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