Orientation of the linear polarization plane of H-alpha emission in prominences

TL;DR

This study maps the polarization deviations in H-alpha prominences, revealing magnetic field orientations and polarities, and confirms consistency with previous measurements, advancing understanding of solar prominence magnetic structures.

Contribution

It provides detailed 2D polarization maps of prominences, demonstrating the existence of both magnetic polarities and supporting the presence of oppositely directed magnetic fields.

Findings

Values of polarization deviation angles agree with previous measurements.

Both positive and negative polarization signs are observed in prominences.

Results support the existence of oppositely directed magnetic fields in prominences.

Abstract

2D distributions of deviations of the polarization plane from the direction tangential to the solar limb (angle \chi) and the sign of \chi are presented for H{\alpha} prominences of March 29, 2006. The obtained values of \chi are in agreement with non-eclipse coronagraphic measurements and indicate the existence of longitudinal magnetic fields. The 2D distributions of the sign of \chi show the existence of both {\guillemotleft}+{\guillemotright} and {\guillemotleft}-{\guillemotright} polarities for each prominence. An interpretation in the frame of the existence of oppositely directed magnetic fields is noted.