Vector Magnetic Fields in Sunspots. I. Stokes Profile Analysis Using the Marshall Space Flight Center Magnetograph
Abstract
The Marshall Space Flight Center (MSFC) vector magnetograph is a tunable filter magnetograph with a bandpass of 125 mA. Results are presented of the inversion of Stokes polarization profiles observed with the MSFC vector magnetograph centered on a sunspot to recover the vector magnetic field parameters and thermodynamic parameters of the spectral line forming region using the Fe I 5250.2 A spectral line using a nonlinear least-squares fitting technique. As a preliminary investigation, it is also shown that the recovered thermodynamic parameters could be better understood if the fitted parameters like Doppler width, opacity ratio, and damping constant were broken down into more basic quantities like temperature, microturbulent velocity, or density parameter.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1991
- DOI:
- 10.1086/170757
- Bibcode:
- 1991ApJ...382..699B
- Keywords:
-
- Solar Magnetic Field;
- Stokes Law Of Radiation;
- Sunspots;
- Circular Polarization;
- Least Squares Method;
- Linear Polarization;
- Zeeman Effect;
- Solar Physics;
- LINE PROFILES;
- POLARIZATION;
- SUN: MAGNETIC FIELDS;
- SUN: SUNSPOTS;
- ZEEMAN EFFECT