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On the structure of the magnetic field of sunspots

Published online by Cambridge University Press:  14 August 2015

E. I. Mogilevsky ,
L. B. Demkina ,
B. A. Ioshpa  and
V. N. Obridko
E. I. Mogilevsky
Affiliation:
Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation of the USSR Academy of Sciences, Moscow
L. B. Demkina
Affiliation:
Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation of the USSR Academy of Sciences, Moscow
B. A. Ioshpa
Affiliation:
Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation of the USSR Academy of Sciences, Moscow
V. N. Obridko
Affiliation:
Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation of the USSR Academy of Sciences, Moscow

Abstract

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The model of the magnetic field of sunspots, taking account of fine structure of magnetic field in solar plasma, is considered. Small-scale subgranules with their own field form magnetic filaments in the external current-free field. The filaments are vertical in the umbra, while in the penumbra they run along the surface with sharp bends. In a number of spot umbra the relation between Doppler velocity and the field is established on polarized spectrograms. The π-component splitting in umbra is interpreted as a result of a weak background magnetic-field existence together with a large field of magnetic filaments. Spectrographic definition of the magnetic field in spot umbra is accomplished on the effect of magnetic-lines intensification and directly on spectrograms of low-excitation (Fe I, Ti I) and high-excitation (Fe II) lines. Magnetic field measured in low-excitation lines exceeds twice the field value obtained in high-excitation lines. This result has been considered in the light of the proposed model of sunspot field.

Type
Part III: Optical Structure of an Active Region
Information
Symposium - International Astronomical Union , Volume 35: Structure and Development of Solar Active Regions , 1968 , pp. 215 - 229
Copyright
Copyright © Reidel 1968 

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