Magnetic fields of low-mass main sequences stars: non-linear dynamo theory and mean-field numerical simulations
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
Magnetic fields of low-mass main sequences stars: non-linear dynamo theory and mean-field numerical simulations
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| Автор |
Kleeorin, N.
Rogachevskii, I. Safiullin, N. Gershberg, R. Porshnev, S. |
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| Тематика |
DYNAMO
MHD STARS: LOW-MASS STARS: MAGNETIC FIELDS TURBULENCE DC GENERATORS INTERACTIVE DEVICES MAGNETOHYDRODYNAMICS DIFFERENTIAL ROTATION DYNAMO THEORIES LOW-MASS MAGNETIC-FIELD MAIN SEQUENCE STARS MEAN-FIELD NON LINEAR SPECTRAL CLASS STARS: LOW MASS STARS: MAGNETIC FIELD ROTATION |
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| Описание |
Our theoretical and numerical analysis have suggested that for low-mass main sequences stars (of the spectral classes from M5 to G0) rotating much faster than the Sun, the generated large-scale magnetic field is caused by the mean-field α2 dynamo, whereby the α2 dynamo is modified by a weak differential rotation. Even for a weak differential rotation, the behaviour of the magnetic activity is changed drastically from aperiodic regime to non-linear oscillations and appearance of a chaotic behaviour with increase of the differential rotation. Periods of the magnetic cycles decrease with increase of the differential rotation, and they vary from tens to thousand years. This long-term behaviour of the magnetic cycles may be related to the characteristic time of the evolution of the magnetic helicity density of the small-scale field. The performed analysis is based on the mean-field simulations (MFS) of the α2 and α2 dynamos and a developed non-linear theory of α2 dynamo. The applied MFS model was calibrated using turbulent parameters typical for the solar convective zone. © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Russian Science Foundation, RSF: 21-72-20067 The work of NK and NS was supported by the Russian Science Foundation (grant 21-72-20067). IR acknowledges the hospitality of NORDITA. |
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| Дата |
2024-04-05T16:34:41Z
2024-04-05T16:34:41Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/submittedVersion |
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| Идентификатор |
Kleeorin, N, Rogachevskii, I, Safiullin, N, Gershberg, R & Porshnev, S 2023, 'Magnetic fields of low-mass main sequences stars: non-linear dynamo theory and mean-field numerical simulations', Monthly Notices of the Royal Astronomical Society, Том. 526, № 2, стр. 1601-1612. https://doi.org/10.1093/mnras/stad2708
Kleeorin, N., Rogachevskii, I., Safiullin, N., Gershberg, R., & Porshnev, S. (2023). Magnetic fields of low-mass main sequences stars: non-linear dynamo theory and mean-field numerical simulations. Monthly Notices of the Royal Astronomical Society, 526(2), 1601-1612. https://doi.org/10.1093/mnras/stad2708 0035-8711 Final All Open Access, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85174534990&doi=10.1093%2fmnras%2fstad2708&partnerID=40&md5=1148406e5dfda031a4135aefbc85ec0c https://arxiv.org/pdf/2308.08957 http://elar.urfu.ru/handle/10995/130869 10.1093/mnras/stad2708 85174534990 001078226700001 |
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| Язык |
en
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| Связанные ресурсы |
info:eu-repo/grantAgreement/RSF//21-72-20067
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| Права |
Open access (info:eu-repo/semantics/openAccess)
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| Формат |
application/pdf
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| Издатель |
Oxford University Press
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| Источник |
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society |
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