Solar Magnetic Field Diagnostics with the Molecular Hanle Effect

TitleSolar Magnetic Field Diagnostics with the Molecular Hanle Effect
Publication TypeConference Paper
Year of Publication2009
AuthorsShapiro, A. I., Fluri D. M., and Berdyugina S. V.
EditorBerdyugina, S. V., Nagendra K. N., and Ramelli R.
Conference NameSolar Polarization 5: In Honor of Jan Stenflo
Date PublishedJun

Weak entangled magnetic fields with mixed polarity occupy the main part of the quiet solar photosphere. While the Zeeman effect diagnostics fail to measure such fields due to cancellation in polarization, the Hanle effect, accessible through the second solar spectrum, provides us with a very sensitive tool for studying the distribution of weak magnetic fields on the Sun. Molecular lines are valuable for magnetic field diagnostics thanks to their broad range of magnetic sensitivities within narrow spectral regions, so that the differential Hanle effect can be employed, which greatly reduces the model dependence of deduced magnetic field strengths. Here we present our recent results on the diagnostic of solar turbulent magnetic fields with the help of CN transitions in the violet system. In addition, we have implemented modeling of coherent scattering in molecular lines into a non-LTE radiative transfer code. Together with the Hanle effect theory this provides us with a realistic model for studying turbulent magnetic fields.