Abstract
Observations of longitudinal and transversal fields and of radial velocities in the magnetic ‘knots’ close to a sunspot were made with the help of Sayan Observatory magnetograph with spatial resolution 1″.2 x 1″.8.
The analysis led to following conclusions:
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(1)
The magnetic field in the knots is mainly vertical. The mean inclination of the magnetic-field vector to the vertical direction is equal to 26°.
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(2)
The phenomenon of darkening is connected with essentially vertical fields and brightening in the faculae with the horizontal fields on the sun.
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(3)
An inverse relation between the value of darkening and the inclination of the field vector to the vertical direction and a direct relation on the longitudinal magnetic-field strength exist for the magnetic knots.
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(4)
The magnetic knots in the active region are located in the Hα flocculi near the line where the radial velocity is changing sign in the photosphere.
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References
Beckers, J. M. and Schröter, E. H.: 1967, in Structure and Development of Solar Active Regions (IAU Symposium no. 35, Budapest, September 1967, ed. by K. O. Kiepenheuer), Reidel, Dordrecht, p. 178.
Sheeley, N. R.: 1966, Astrophys. J. 144, 723.
Sheeley, N. R.: 1967, Solar Phys. 1, 171.
Stankiewicz, A.: 1967, Acta Astron. 17, 141.
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Grigorjev, V.M. Magnetic knots near a sunspot. Sol Phys 6, 67–71 (1969). https://doi.org/10.1007/BF00146796
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DOI: https://doi.org/10.1007/BF00146796