Effect of noise on sunspot magnetic field parameters

Details Effect of noise on sunspot magnetic field parameters Effect of noise on sunspot magnetic field parameters

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990an....311..305l&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 311, no. 5, 1990, p. 305-307.

Astronomy and Astrophysics

Astronomy

Background Noise, Magnetic Field Configurations, Solar Magnetic Field, Sunspots, Current Density, Lorentz Force, Magnetic Dipoles, Solar Activity Effects

Scientific paper

A perturbed (noised) dipole model of a sunspot magnetic field structure is used to simulate the influence of background noise or apparent noise (unresolved small-scale magnetic-field structure) on sunspot magnetic-field parameters. Mean values of the vertical and horizontal electric-current densities, of the force-free parameter alpha, and of the Lorentz force are compared with those of a standard sunspot magnetic-field model (Osherovich, 1982) and with observations for quiet sunspots. The estimated values show clearly that due to the noise the axisymmetric magnetic dipole model is clustered into several subsystems of flux bundles. The latter are connected with a system of electric current densities of the order of 0.001 A/sq m (vertical) and 0.1 A/sq m (horizontal); i.e., this system is a noise-generated nonaxisymmetric magnetohydrostatic model.

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