@inproceedings{bd2786b4645044e3bf0ba4701da3c2bb,
title = "Net circular polarization of sunspot penumbrae - A versatile tool for diagnosing magnetic field structure",
abstract = "Sunspot penumbrae harbor highly structured magnetic fields and flows. The moving flux tube model (Schlichenmaier et al. 1998) offers an explanation for several observed phenomena, e.g. the Evershed effect and bright penumbral grains. In this work, we present a generalized 3D model that embeds an arbitrarily shaped flux tube in a stratified magnetized atmosphere. The new model is a versatile tool to calculate the spectral signature of flux tubes in the penumbra and especially make predictions about the flow speed and tube inclination from observed maps of the net circular polarization (NCP). As a first result, we find that the inclination of downflows in the outer penumbra must be shallower than approximately 15°.",
author = "Muller, {Daniel A.N.} and R. Schlichenmaier and G. Fritz and C. Beck",
year = "2006",
month = jul,
day = "1",
language = "English",
isbn = "9290929286",
series = "European Space Agency, (Special Publication) ESA SP",
number = "617",
booktitle = "Proceedings of SOHO-17",
edition = "617",
note = "SOHO-17: 10 Years of SOHO and Beyond ; Conference date: 07-05-2006 Through 12-05-2006",
}