Observed Lα profiles for two solar flares: 14∶12 UT 15 June, 1973 and 23∶16 UT 21 January, 1974
Abstract
Photographic observations of the time development of the profile of the Lα line of hydrogen during flares were obtained with the NRL spectrograph on ATM. The profiles for the 15 June, 1973 and 21 January, 1974 flares reported here cover both core and wings of the line. The time sequences begin before flare maximum, and continue well into the decay phase. Careful attention has been given to photometry and absolute calibration. In the case of the 15 June, 1973 flare, data are presented both first-order corrected and uncorrected for incomplete filling of the spectrograph slit by flaring material. Correction of the 21 January, 1974 flare was not possible. We discuss core symmetry and shift, and show that our observations imply integrated flare Lα/Hα intensity ratios within a factor of two of unity for these two flares.
- Publication:
-
Solar Physics
- Pub Date:
- August 1980
- DOI:
- 10.1007/BF00149811
- Bibcode:
- 1980SoPh...67..339C
- Keywords:
-
- H Alpha Line;
- Hydrogen;
- Line Shape;
- Lyman Alpha Radiation;
- Solar Flares;
- Solar Spectra;
- Spectrum Analysis;
- Data Acquisition;
- Data Reduction;
- Periodic Variations;
- Skylab Program;
- Spectrographs;
- Tables (Data);
- Solar Physics;
- Hydrogen;
- Flare;
- Time Development;
- Intensity Ratio;
- Solar Flare