SIMULTANEOUS MAGNETIC FIELD MEASUREMENTS IN SUNSPOTS USING SPECTRAL LINES WITH DIFFERENT LANDE FACTORS

Автор(и)

  • S. N. Osipov Main Astronomical Observatory of NAS of Ukraine, Україна
  • V. G. Lozitsky Taras Shevchenko National University of Kyiv, Україна

DOI:

https://doi.org/10.18524/1810-4215.2015.28.71117

Ключові слова:

Sun, Solar magnetic fields – Sunspots, direct measurements – Lande factors

Анотація

We present magnetic field measurements in several sunspots observed in June-July 2015 on Horizontal Solar Telescope ATsU-5 of Main Astronomical Observatory of National Academy of Sciences of Ukraine. The Zeeman splittings were measured using I ± V profiles of about ten spectral lines of Mn I, Fe I and Ni I including three lines with negative Lande factors, namely Fe I 5434.527 Å, Fe I 6094.419 Å and Fe I 4995.411 Å ( geff = – 0.014, – 0.218, and – 0.25, respectively). Our main conclusions are the following: a) as rule, spectral lines with largest Lande factors give the strongest measured magnetic fields Bobs in sunspot umbra that can be interpreted as a result of blending the Zeeman π- and σ-components in case of non-longitudinal magnetic field. b) in some places of sunspots, Bobs differs also for lines with close Lande factors, e.g. by Fe I 5432.950 and Ni I 5435.871 (geff = 0.67 and 0.5, respectively). c) lines Fe I 6094.419 Å and Fe I 4995.411 Å with geff < 0 have in sunspots signs of splitting which corresponds to geff > 0. The possible causes of named effects are discussed in short form.

Посилання

Gopasyuk S.I. et al.: 1973, Solar Phys. 31, 307.

Lozitsky V.G.: 1980, Phys. Solariterr., Potsdam, 14, 88.

Lozitsky V.G.: 2009, Bull. Crim. Astrophys. Obs. 104, No.6, 132.

Lozitsky V.G.: 2011, Int. J. Astron. Astrophys. 1 (3), 147.

Lozitsky V.G.: 2015, Adv. Space Res. 55, 958.

Semel M.: 1981, Astron. Astrophys. 97, 75.

Solanki S.K., Stenflo J.O.: 1984, Astron.Astrophys. 140, 185.

Stenflo J.O.: 1973, Solar Phys., 32, 41.

##submission.downloads##

Опубліковано

2016-06-13

Номер

Розділ

Сонце, сонячна активність та астробіологія