Measuring Electron Density in Coronal Active Regions - Part Two - a Multichannel Coronagraph with a Photoelectric Spectrograph and a Reflex Monitor at Lambda 5303A
Abstract
In order to study the electron density at the scale of the most encountered structures in coronal active regions a new multichannel coronagraph associated with a photoelectric spectrograph is now used at the Pic-du-Midi Observatory. In its quasi-routine mode this instrument, which is described in this paper, works with a 30″ field aperture in a parallel manner with aK-polarimeter. On each observed region it obtains maps of intensities of theλλ3388, 10747, and 10798 Å emission lines due to FeXIII ion. Each measurement point is associated with a quasi-simultaneous image of the emission corona structures viewed in the light of theλ5303 Å line of FeXIV. Three examples of observations are given and the capabilities are discussed.
- Publication:
-
Solar Physics
- Pub Date:
- August 1984
- DOI:
- 10.1007/BF00154813
- Bibcode:
- 1984SoPh...94..117N
- Keywords:
-
- Coronagraphs;
- Electron Density (Concentration);
- Solar Activity;
- Solar Corona;
- Spectroheliographs;
- Emission Spectra;
- Iron;
- Line Spectra;
- Solar Spectra;
- Solar Physics;
- Active Region;
- Measurement Point;
- Emission Line;
- Parallel Manner;
- Corona Structure