Some tests of a new magnetosheath model via comparison with satellite measurement

Abstract. This paper presents a case study of the plasma parameters in the magnetosheath, based on THEMIS measurements. As a theoretical tool we apply the self-consistent magnetosheath-magnetosphere model. A specific aspect of the model is that the positions of the bow shock and the magnetopause are self-consistently determined. In the magnetosheath the distribution of the velocity, density and temperature is calculated, based on the gas-dynamic theory. The magnetosphere module allows for the calculation of the magnetopause currents, confining the magnetic field into an arbitrary non-axisymmetric magnetopause. The variant of the Tsyganenko magnetic field model is applied as an internal magnetic field model. As solar wind monitor we use measurements from the WIND spacecraft. The results show that the model quite well reproduces the values of the ion density and velocity in the magnetosheath. The simlicity of the model allows calulations to be perforemed on a personal computer, which is one of the mean advantages of our model.

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“…Here we apply the algorithm, that was already used in our previous papers, considering satellite data interpretation [10,11,16].…”

Section: Model Resultsmentioning

confidence: 99%

“…A more detailed description of the numerical algorithm, used in the calculations, can be found in previous papers [10,11,15,16].…”

Section: Short Description Of the Modelmentioning

confidence: 99%

A case study of the plasma in the magneto-sheath using the numerical magnetosheath-magnetosphere model and THEMIS measure-ments

2018

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“…Description of the magnetosheath properties is based on the single fluid approach, as the density and velocity are that of the ions, but the temperature is a sum of the ion and electron temperatures. A more detailed description of the numerical model, used here, can be found in some previous papers [4,10,11] 3 Satellite measurements, used in the study…”

Section: Brief Description Of the Numerical Magnetosheathmagnetosphermentioning

confidence: 99%

Experimental and numerical investigation of plasma parameters in the magnetosheath

et al. 2018

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Abstract.We investigate the behaviour of the plasma parameters in the magnetosheath in a case when Interball-1 satellite stayed in the magnetosheath, crossing the tail magnetopause. In our analysis we apply the numerical magnetosheath-magnetosphere model as a theoretical tool. The bow shock and the magnetopause are self-consistently determined in the process of the solution. The flow in the magnetosheath is governed by the Euler equations of compressible ideal gas. The magnetic field in the magnetosphere is calculated by a variant of the Tsyganenko model, modified to account for an asymmetric magnetopause. Also, the magnetopause currents in Tsyganenko model are replaced by numericaly calulated ones. Measurements from WIND spacecraft are used as a solar wind monitor. The results demonstrate a good agreement between the model-calculated and measured values of the parameters under investigation.

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“…The model magnetosheath-magnetosphere is created in the Institute of Mechanics, Bulgarian Academy of Sciences [4]. In the area of magnetosheath, the Euler's equations of a compressible ideal gas are used for a description of the shocked solar wind.…”

Section: Brief Description Of the Modelmentioning

confidence: 99%

Optimization of the Code of the Numerical Magnetosheath-Magnetosphere Model

Dobreva¹

2013

Journal of Theoretical and Applied Mechanics

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Abstract. The proposed three dimensional model contains two earlier developed 3D regional numerical models: a grid-characteristic model of the magnetosheath and a finite element model of the magnetosphere. The model output is the distribution of gas-dynamic parameters in the magnetosheath and of magnetic field inside the magnetosphere. The efforts are focused on the modernization of the existing software, written in Fortran, using several techniques for parallel programming such as OpenMP extensions. After analyzing the numerical performance of the model a possible scenario for the code optimization is shown. First results with the improved variant of the model are presented.

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Some tests of a new magnetosheath model via comparison with satellite measurement

Cited by 8 publications

References 14 publications

A case study of the plasma in the magneto-sheath using the numerical magnetosheath-magnetosphere model and THEMIS measure-ments

A case study of the plasma in the magneto-sheath using the numerical magnetosheath-magnetosphere model and THEMIS measure-ments

Experimental and numerical investigation of plasma parameters in the magnetosheath

Optimization of the Code of the Numerical Magnetosheath-Magnetosphere Model

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