The Observation of the Structure of the Magnetic Field in Sunspots
Abstract
A new method of measuring the intensity and determining the orientation of the magnetic field of sunspots is described. A polarimetric optical system consisting of a bi-prism, a quarterwave plate, and an analysing double image prism is combized with the tower telescope of the Tokyo Astronomical Observatory, and the spectrum of a line of the normal Zeeman triplet is taken in four different polarizations. on the basis of Unno's theory of the line formation of a Zeeman triplet, calculations are made for various intensities and orientations of the magnetic field and with various line intensities; and a method is developed to analyse the observational data with the results of these calculations. The resulting field strength variation across a sun-spot is found to be in agreement with Broxon's law, while the orientation of the magnetic line of force is found to be differut from earlier determinations. In particular, the magnetic line of force in penumbra appears to be nearly horizontal. (>8O )
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- 1962
- Bibcode:
- 1962PASJ...14..325N