Investigation of Spatially Unresolved Magnetic Field Outside Sunspots Using Hinode/SOT Observations
Abstract
The structure of photospheric magnetic fields outside sunspots is investigated in three active regions using Hinode/Solar Optical Telescope(SOT) observations. We analyze Zeeman effect in FeI 6301.5 and FeI 6302.5 lines and determine the observed magnetic field value B eff for each of them. We find that the line ratio B eff(6301)/B eff(6302) is close to 1.3 in the range B eff < 0.2 kG, and close to 1.0 for 0.8 kG < B eff < 1.2 kG. We find that the observed magnetic field is formed by flux tubes with the magnetic field strengths 1.3 - 2.3 kG even in places with weak observed magnetic field fluxes. We also estimate the diameters of smallest magnetic flux tubes to be 15 - 20 km.
- Publication:
-
Astroinformatics
- Pub Date:
- June 2017
- DOI:
- 10.1017/S1743921316013016
- Bibcode:
- 2017IAUS..325...59B
- Keywords:
-
- Sun: magnetic fields;
- photosphere