Toroidal Flux Ropes with Elliptical Cross Sections and Their Magnetic Helicity

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00484736" target="_blank" >RIV/67985815:_____/17:00484736 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/s11207-017-1149-5" target="_blank" >http://dx.doi.org/10.1007/s11207-017-1149-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-017-1149-5" target="_blank" >10.1007/s11207-017-1149-5</a>

Result language

angličtina

Original language name

Toroidal Flux Ropes with Elliptical Cross Sections and Their Magnetic Helicity

Original language description

Axially symmetric constant-alpha force-free magnetic fields in toroidal flux ropes with elliptical cross sections are constructed in order to investigate how their alphas and magnetic helicities depend on parameters of the flux ropes. Magnetic configurations are found numerically using a general solution of a constant-alpha force-free field with an axial symmetry in cylindrical coordinates for a wide range of oblatenesses and aspect ratios. Resulting alphas and magnetic helicities are approximated by polynomial expansions in parameters related to oblateness and aspect ratio. These approximations hold for toroidal as well as cylindrical flux ropes with an accuracy better than or of about 1%. Using these formulae, we calculate relative helicities per unit length of two (probably very oblate) magnetic clouds and show that they are very sensitive to the assumed magnetic cloud shapes (circular versus elliptical cross sections).

Czech name

—

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

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

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

Name of the periodical

Solar Physics

ISSN

0038-0938

e-ISSN

—

Volume of the periodical

292

Issue of the periodical within the volume

9

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

23

Pages from-to

"129/1"-"129/23"

UT code for WoS article

000410921800014

EID of the result in the Scopus database

2-s2.0-85028958631