The Spectra of Two Active Regions Observed at the Sun's Limb.
Abstract
Emission was observed in 109 lines between 3968 and 5903 A in the spectrum of a prominence of the active sunspot type (Pettit's class IlIc). Emission was observed in 126 lines from 3670 to 5900 A in a flare of intensity < 1. Atoms observed in the prominence and flare were H, He I, Na I, Mgi, Ali, Sir, Cai, Fei, Ca ii, Sc ii, Ti II, Cru, Feir, Sr II, V ii,and Ban. The Balmer series appeared in emission in the flare to H21, which is near the limit of transmission for the 75-foot spectrograph. The intensity of emission in lines of hydrogen and helium was about the same in the prominence and the small flare, but most of the metallic lines appeared stronger in the prominence.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1950
- DOI:
- 10.1086/145298
- Bibcode:
- 1950ApJ...111..572R