Double ionization of H- ions by electron impact in the solar atmosphere
- Authors
- Jung, Young-Dae
- Issue Date
- Feb-2008
- Publisher
- IOP PUBLISHING LTD
- Keywords
- atomic processes; Sun : atmosphere
- Citation
- ASTROPHYSICAL JOURNAL, v.674, no.2, pp.1207 - 1210
- Indexed
- SCIE
SCOPUS
- Journal Title
- ASTROPHYSICAL JOURNAL
- Volume
- 674
- Number
- 2
- Start Page
- 1207
- End Page
- 1210
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/42646
- DOI
- 10.1086/526417
- ISSN
- 0004-637X
- Abstract
- The double ionization of H- ions by the generalized Lorentzian distribution of electrons in the solar atmosphere is investigated. The Born-Bethe formula for the multielectron ionization cross section is employed in order to obtain the double-ionization rate for H- as a function of the spectral index and thermal energy. It is shown that the double-ionization rates of H- are greater in non-Maxwellian plasmas than in Maxwellian plasmas in the low-temperature region. It is also shown that the nonthermal character of the solar plasma increases the double-ionization rates of H- in the solar photosphere and chromosphere. In addition, we found that the double-ionization rates of H- in the solar photosphere and chromosphere increase with increasing the plasma temperature. It is also shown that the high-energy corrections enhance the double-ionization rates in non-Maxwellian plasmas, and that the high-energy corrections on the double-ionization rate increase with increasing the plasma temperature.
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