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Investigation of Spatially Unresolved Magnetic Field Outside Sunspots Using Hinode/SOT Observations

Published online by Cambridge University Press:  30 May 2017

Olga Botygina ,
Mykola Gordovskyy  and
Vsevolod Lozitsky
Olga Botygina
Affiliation:
Astronomical Observatory of Taras Shevchenko National University of Kyiv Observatorna str., 3, Kyiv 04053, Ukraine email: olga.botygina@gmail.com
Mykola Gordovskyy
Affiliation:
Jodrell Bank Centre for Astrophysics, University of Manchester, Alan Turing building, Manchester M13 9PL, United Kingdom
Vsevolod Lozitsky
Affiliation:
Astronomical Observatory of Taras Shevchenko National University of Kyiv Observatorna str., 3, Kyiv 04053, Ukraine email: olga.botygina@gmail.com
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Abstract

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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 Beff for each of them. We find that the line ratio Beff(6301)/Beff(6302) is close to 1.3 in the range Beff < 0.2 kG, and close to 1.0 for 0.8 kG < Beff < 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.

Keywords

Sun: magnetic fieldsphotosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S325: Astroinformatics , October 2016 , pp. 59 - 62
Copyright
Copyright © International Astronomical Union 2017 

References

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