Abstract
The magnetic structure of a simple, relatively symmetric sunspot is determined using the extremely Zeeman sensitive Landé g = 3 line of Fe I at 1.5648 μm. From the measured strength and inclination of the magnetic field we estimate the fraction of the total magnetic flux of the sunspot passing through the solar surface in the penumbra. It is found that on average approximately 1/2–2/3 of the total magnetic flux of the spot emerges in the penumbra. Sunspot penumbrae are therefore deep, i.e., the τ = 1 level does not correspond to the lower magnetic boundary of the spot in its penumbra.
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© 1994 Springer Science+Business Media Dordrecht
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Solanki, S.K., Rüedi, I., Livingston, W., Schmidt, H.U. (1994). 1.5 µm Observations and the Depth of Sunspot Penumbrae. In: Rabin, D.M., Jefferies, J.T., Lindsey, C. (eds) Infrared Solar Physics. International Astronomical Union / Union Astronomique Internationale, vol 154. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1926-9_55
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DOI: https://doi.org/10.1007/978-94-011-1926-9_55
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