Interstellar medium magnetic field in bow shock modelling

Kotlarz, Jan; Ratkiewicz, R.; Konior, Wojciech

doi:10.1108/aeat-01-2018-0004

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…For example, the choice of different interstellar magnetic field can have significant impact on the bow shock/wave properties such as its shape, size, and intensity (for example, see Kotlarz et al. 2018 , and reference therein). However, the properties of the unperturbed LISM are not measured directly, and Voyager measurements of the VLISM are made in the region highly affected by the presence of the heliosphere.…”

Section: The Heliospheric Bow Shock/wavementioning

confidence: 99%

Shocks in the Very Local Interstellar Medium

Mostafavi

Gurnett

2022

Space Sci Rev

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Large-scale disturbances generated by the Sun’s dynamics first propagate through the heliosphere, influence the heliosphere’s outer boundaries, and then traverse and modify the very local interstellar medium (VLISM). The existence of shocks in the VLISM was initially suggested by Voyager observations of the 2-3 kHz radio emissions in the heliosphere. A couple of decades later, both Voyagers crossed the definitive edge of our heliosphere and became the first ever spacecraft to sample interstellar space. Since Voyager 1’s entrance into the VLISM, it sampled electron plasma oscillation events that indirectly measure the medium’s density, increasing as it moves further away from the heliopause. Some of the observed electron oscillation events in the VLISM were associated with the local heliospheric shock waves. The observed VLISM shocks were very different than heliospheric shocks. They were very weak and broad, and the usual dissipation via wave-particle interactions could not explain their structure. Estimates of the dissipation associated with the collisionality show that collisions can determine the VLISM shock structure. According to theory and models, the existence of a bow shock or wave in front of our heliosphere is still an open question as there are no direct observations yet. This paper reviews the outstanding observations recently made by the Voyager 1 and 2 spacecraft, and our current understanding of the properties of shocks/waves in the VLISM. We present some of the most exciting open questions related to the VLISM and shock waves that should be addressed in the future.

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Section: The Heliospheric Bow Shock/wavementioning

confidence: 99%

Shocks in the Very Local Interstellar Medium

Mostafavi

Gurnett

2022

Space Sci Rev

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“…The existence, general shape and instabilities growth of the BS around the stars and in particular around the heliosphere has been discussed by Kotlarz et al (2018). The uncertainty of the existence of the BS around the heliosphere (Ben-Jaffel and Ratkiewicz, 2012; McComas et al , 2012; Zank et al , 2013; Zieger et al , 2013; Scherer and Fichtner, 2014; Ratkiewicz and Kotlarz, 2016) occurs because the intensity and direction of the ISMF are still not well known.…”

Section: What Influences the Shape And Structure Of The Heliosphere?mentioning

confidence: 99%

Remarks about factors shaping the heliosphere

Ratkiewicz

Konior

Kotlarz

2018

AEAT

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Purpose The purpose of the paper is to give a brief description of the new topic introduced for the first time at the EASN Conferences. Design/methodology/approach The topic concerns the heliosphere, the nearest surrounding of the Sun and thus the nearest vicinity of the Earth. The heliosphere is created due to the interaction between the solar wind and the local interstellar medium. Findings This paper does not include any new information about the heliosphere and only introduces a new topic to this journal. It is briefly shown how heliospheric structures are formed, what factors affect a shape of the heliosphere, what measurements are made by Ulysses, Voyager and IBEX space missions (important for the heliosphere modeling) and how obtained data are used to validate theoretical results. Practical implications To categorize the paper under one of these classifications, research paper, viewpoint, technical paper, conceptual paper, case study, literature review or general review, the authors chose a paper type, general review, as the closest category to this paper. However, it is not a purpose of this paper to provide an extensive review of the community efforts to investigate the physical processes in the vicinity of the heliosphere interface. This is mostly a status report. Originality/value As the new topic in this journal, the article introduces in detail only a small number of aspects connected with heliosphere models. Interplanetary and interstellar magnetic field structures are primarily described. Other factors are only mentioned.

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“…The study of the flow through the porous medium under the influence of the magnetic field can be used for several engineering applications to analyse the behaviour of the flow medium. Designing the MHD model increases the knowledge on conducting of the flows and its behaviour under different circumstances (Kotlarz et al, 2018). Further, exposing the new model using the numerical methods attracted the ample of interest due to its extensive applications.…”

Section: Introductionmentioning

confidence: 99%

Rotating flow thorough parallel plates with the various inclined magnetic field under the influence of hall current

Pichaimuthu

Swaminathan

2021

AEAT

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Purpose The Purpose of this study to examine the magneto hydrodynamics (MHD) using the analytical and numerical tool. In recent years, MHD growing tremendously due to the presence of multidisciplinary application in solving the tedious problems in the viscous flow. Design/methodology/approach The flows between the parallel plates under the steady inclined magneto hydrodynamic force were studied under the presence of different hall current and pressure gradient. The system was designed with the Darcian porous medium subjected to the incompressible flow. To analyse the flow reactions through stationary parallel plates, the governing equations were used using the integral transformation. Findings The velocity of the flows depends on the Hall parameter. As the intensity of the magnetic field increases the velocity of the flow is affected significantly. On the other hand, the radiation parameters also affect the flow of any medium through the porous medium. Practical implications Implementation of the Laplace and Fourier transform increases the reliability of the obtained results and further decreases the uncertainty during the measurement of the velocity of the flow without any restraints. Originality/value From the evident results, it is clear that the proposed MHD model can be applied to several operations of the fluid dynamic models. Further, the application of this technique will decrease the uncertainty in the results compared to the conventional computational models and other finite element and difference approaches.

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Interstellar medium magnetic field in bow shock modelling

Cited by 3 publications

References 16 publications

Shocks in the Very Local Interstellar Medium

Shocks in the Very Local Interstellar Medium

Remarks about factors shaping the heliosphere

Rotating flow thorough parallel plates with the various inclined magnetic field under the influence of hall current

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