Bidimensional spectroscopy of network bright points. I - Morphological properties
Abstract
An automatic computer-controlled method for the selection and analysis of network bright points (NBPs) on solar images is proposed which uses a universal birefringent filter (monitoring the H-beta, Mg-b1, and Na-D2 lines) and a H-alpha Zeiss Filter (monitoring the H-alpha line). Identification constraints are discussed, and various parameters, including position, area, mean and maximum contrast, Dopplergram velocity, and compactness, are measured for each NBP. Two types of NBPs are identified, the more frequently occurring type Is (found on the boundaries of the supergranular network) and the type IIs (preferentially found in the neighborhood of small, compact sunspots).
- Publication:
-
Solar Physics
- Pub Date:
- 1987
- DOI:
- 10.1007/BF00193065
- Bibcode:
- 1987SoPh..114...29F
- Keywords:
-
- Astronomical Spectroscopy;
- Line Spectra;
- Solar Granulation;
- Solar Spectra;
- Spectrum Analysis;
- Astronomical Photography;
- Automatic Control;
- H Alpha Line;
- H Beta Line;
- Magnesium;
- Sodium;
- Solar Physics