Accepted articles

Physics of our days


Magnetic helicity and the prospects for its observation in the interstellar medium

 a, b,  c, d
a Institute of Continuous Media Mechanics, Ural Branch of the Russian Academy of Sciences, ul. akad. Koroleva 1, Perm, 614013, Russian Federation
b Perm National Research Polytechnic University, Komsomol'skii prosp. 29, Perm, 614990, Russian Federation
c Lomonosov Moscow State University, Department of Physics, Vorobevy gory, Moscow, 119992, Russian Federation
d Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Kaluzhskoe shosse 4, Troitsk, Москва, 108840, Russian Federation

Magnetic helicity is one of the inviscid integrals of motion in magnetic hydrodynamics, which characterizes the linkage of magnetic lines with a medium, and belongs to a set of helices which characterize the degree of mirror asymmetry of magnetic field and velocity vortex lines. Helicities determine the generation of large-scale magnetic fields in stars and spiral galaxies. Until recently, the estimates of various helicities form astronomical observations was possible only for the active regions of the Sun, but not for the deep layers of the Sun where the solar dynamo operates. Therefore, it is important to observe helicity in galaxies that are transparent. The achievements of the theory and the first successful attempts of such observations are described in the article.

Text is available here.

Keywords: galactic magnetic fields of galaxies, magnetic helicity, astrophysical observations, synchrotron emission, Faraday rotation, dynamo theory
PACS: 47.65.Md, 98.35.Eg, 95.85.Sz (all)
DOI: 10.3367/UFNe.2018.12.038503
Citation: Stepanov R A, Sokoloff D D "Magnetic helicity and the prospects for its observation in the interstellar medium" Phys. Usp., accepted

Received: 12th, November 2018, 19th, December 2018

Оригинал: Степанов Р А, Соколов Д Д «Магнитная спиральность и перспективы её наблюдения в межзвёздной среде» УФН, принята к публикации; DOI: 10.3367/UFNr.2018.12.038503

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