Recent studies of magnetic canopies
Abstract
Two current studies are described which stem from Giovanelli's seminal studies of the spreading of chromospheric fields near active regions and active-region network. First, improved observational techniques are described for obtaining magnetograms in the Ca II 8542 A, Fe I 8688 A, and C I 9111 A lines which at least in principle allow for more accurate treatment of instrumental noise and allow better inference of field orientation. Second, a generalized response function is developed for calculating theoretical magnetograph signals from arbitrary line-of-sight variations of magnetic field, and initial applications to two-dimensional, potential-field models of network fields are described. Preliminary indications are that potential-field models can better explain the presence of low-lying, diffuse horizontal fields than can thin flux-tube models, but fail to predict a differential response between the different lines.
- Publication:
-
Australian Journal of Physics
- Pub Date:
- 1985
- DOI:
- 10.1071/PH850919
- Bibcode:
- 1985AuJPh..38..919J
- Keywords:
-
- Chromosphere;
- Magnetic Field Configurations;
- Solar Activity;
- Solar Magnetic Field;
- Magnetic Signatures;
- Stellar Models;
- Two Dimensional Models;
- Solar Physics