Helium-Like Ion Forbidden Line Emission, and Solar Active Regions
Abstract
A theory has been developed for interpreting the intensity of the 1s2 1S-1s2s 3S forbidden line in helium-like ions in terms of electron density at the source. In a recent soft X-ray rocket experiment, this transition has been observed simultaneously from C V, N VI and O VII. New values for the forbidden transition probabilities are derived in a semi-empirical manner using this data. The new values lead to derived solar densities in active regions of between 1011 and 1013 cm-3.
- Publication:
-
Philosophical Transactions of the Royal Society of London Series A
- Pub Date:
- July 1971
- DOI:
- 10.1098/rsta.1971.0067
- Bibcode:
- 1971RSPTA.270..127F