Comparative study of a constant-alpha force-free field and its approximations in an ideal toroid

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F15%3A00452182" target="_blank" >RIV/67985815:_____/15:00452182 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1051/0004-6361/201526242" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201526242</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201526242" target="_blank" >10.1051/0004-6361/201526242</a>

Result language

angličtina

Original language name

Comparative study of a constant-alpha force-free field and its approximations in an ideal toroid

Original language description

Magnetic clouds in the solar wind are large, loop-like interplanetary flux ropes and may be locally approximated by a toroidal flux rope. We compare approximate constant-alpha force-free fields in an ideal toroid, used in magnetic cloud analysis, with the exact solution, and examine their validity for low aspect ratios, which can be found in magnetic clouds. The approximate toroidal solutions were originally derived under the assumption of large aspect ratios. The Miller & Turner (1981, Phys. Fluids, 24, 363) field and its modification (to satisfy exact solenoidality) match the position of the magnetic axis in the toroidal flux rope well even for very low aspect ratios. The same can be said for the modified field and the position of the magnetic field maximum. When calculating helicity of the toroidal flux rope, the Miller & Turner field yields better results. A simple formula for magnetic helicity derived from the Miller & Turner solution is valid with a good accuracy even for very low aspect ratios.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA14-19376S" target="_blank" >GA14-19376S: Driving of the Earth magnetosphere by ICMEs and CIRs</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

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

Name of the periodical

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

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Volume of the periodical

580

Issue of the periodical within the volume

August

Country of publishing house

FR - FRANCE

Number of pages

7

Pages from-to

"A123/1"-"A123/7"

UT code for WoS article

000360020200123

EID of the result in the Scopus database

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