Comparison of magnetic fields in quiescent solar prominences measured by D3 HeI and Hα lines

Abstract

The data of magnetic field measurements in fourth quiescent solar prominences of 26 September 2011, 20 October 2011, 7 November 2011, 9 November 2011 are presented. Observations were made on Echelle spectrograph of Astronomical Observatory of National Taras Shevchenko University of Kyiv. Magnetic fields were measured by Zeeman splitting of I±V profiles of D3 HeI and Hα lines on heights of 3–12 Mm in the Sun’s atmosphere. The amplitude values of local strengths in named prominences were found in range from 0 to 1240 G for Hα line and from 0 to 1220 G for D3 line. Amplitude values of local strengths were determined from splitting of bisectors in central parts of profiles, at intensity level of 0.9. In contrast to active prominences, studied by authors earlier, in quiescent prominences the anticorrelation effect of measured magnetic strengths in helium and hydrogen lines was not found.