Dynamics of a spherical obstacle

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00618571" target="_blank" >RIV/67985815:_____/25:00618571 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0365651" target="_blank" >https://hdl.handle.net/11104/0365651</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202451795" target="_blank" >10.1051/0004-6361/202451795</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamics of a spherical obstacle

Popis výsledku v původním jazyce

A magnetized plasma cloud acts as a magnetic obstacle to an external plasma flow. We used an analytical approach to examine forces acting on a spherical static obstacle, which can be applied to the kinematic analysis of the obstacle's motion. Aims. We aimed to determine the magnetic field in the sheath region around a spherical obstacle for cases when the background magnetic field is perpendicular, parallel, or at an arbitrary angle to the plasma flow direction. Additionally, we calculated the diagmagnetic force exerted by the magnetic field on the obstacle. Methods. We applied a potential field method, under the conditions that the normal component of the magnetic field is conserved on the bow shock and is zero at the obstacle. We analytically determined the modification of the background magnetic field by a supersonic obstacle. Results were compared with the field modification by a slow, subsonic obstacle. Uniform and nonuniform background magnetic fields were considered and the diamagnetic force acting on an obstacle was calculated. Results. The diamagnetic force on the slow obstacle in the ambient field is zero, while the supersonic obstacle experiences a decelerating diamagnetic force in the uniform background field. The magnetic field with a gradient produces an accelerating diamagnetic force on a subsonic obstacle, pushing it away from a stronger magnetic field. The diamagnetic force on the supersonic obstacle from the nonuniform background field is much weaker.

Název v anglickém jazyce

Dynamics of a spherical obstacle

Popis výsledku anglicky

A magnetized plasma cloud acts as a magnetic obstacle to an external plasma flow. We used an analytical approach to examine forces acting on a spherical static obstacle, which can be applied to the kinematic analysis of the obstacle's motion. Aims. We aimed to determine the magnetic field in the sheath region around a spherical obstacle for cases when the background magnetic field is perpendicular, parallel, or at an arbitrary angle to the plasma flow direction. Additionally, we calculated the diagmagnetic force exerted by the magnetic field on the obstacle. Methods. We applied a potential field method, under the conditions that the normal component of the magnetic field is conserved on the bow shock and is zero at the obstacle. We analytically determined the modification of the background magnetic field by a supersonic obstacle. Results were compared with the field modification by a slow, subsonic obstacle. Uniform and nonuniform background magnetic fields were considered and the diamagnetic force acting on an obstacle was calculated. Results. The diamagnetic force on the slow obstacle in the ambient field is zero, while the supersonic obstacle experiences a decelerating diamagnetic force in the uniform background field. The magnetic field with a gradient produces an accelerating diamagnetic force on a subsonic obstacle, pushing it away from a stronger magnetic field. The diamagnetic force on the supersonic obstacle from the nonuniform background field is much weaker.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA17-06065S" target="_blank" >GA17-06065S: Variace slunečního větru a jejich vazba na dynamiku magnetosféry Země</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

695

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

8

Strana od-do

A134

Kód UT WoS článku

001442985200026

EID výsledku v databázi Scopus

2-s2.0-86000796470