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Effect of noise on sunspot magnetic field parameters
Author(s) -
Linke J.,
Utrobin V. G.
Publication year - 1990
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113110513
Subject(s) - physics , sunspot , magnetic field , lorentz force , noise (video) , magnetic dipole , magnetic flux , dipole , dipole model of the earth's magnetic field , computational physics , electric current , electric field , flux (metallurgy) , astrophysics , interplanetary magnetic field , solar wind , quantum mechanics , artificial intelligence , computer science , image (mathematics) , materials science , metallurgy
Using a perturbated (noised) dipole model of a sunspot magnetic field structure we simulated the influence of background noise or apparent noise (unresolved small‐scale magnetic field structure) on sunspot magnetic field parameters. We evaluated mean values of the vertical and horizontal electric current densities | j | ∥ and | j | ⊥ , respectively, of the force‐free parameter α and of the Lorentz force | F |. For comparison we estimated | j ⊥ | and | F | of a standard sunspot magnetic field model (return‐flux model, O SHEROVICH 1982). Furthermore, we compared our results with those from observations resulting in estimated values of | j | ∥ for quiet sunspots. Our investigation led to the following results: the estimated values of 〈| F |〉 show clearly that due to the noise the axisymmetric magnetic dipole model is clustered into several subsystems of fluxbundles. The latter are connected with a system of electric current densities of the order of | j | ∥ ∼ 10 −3 Am −2 and | j | ⊥ = 10 −1 Am −2 , i.e., this system is a noise‐generated nonaxisymmetric magnetohydrostatic model.