Ionisation Equilibrium for the Non-Maxwellian Electron n $n$ -Distributions in Solar Flares: Updated Calculations
| Autor: | Jaroslav Dudík, Elena Dzifčáková |
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| Rok vydání: | 2015 |
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| Zdroj: | Solar Physics. 290:3545-3558 |
| ISSN: | 1573-093X 0038-0938 |
| DOI: | 10.1007/s11207-015-0734-8 |
| Popis: | We use the latest available atomic data to calculate the ionisation and recombination rates for the non-Maxwellian $n$ -distributions, which were shown previously to provide a good fit to the enhanced intensities of dielectronic satellite lines during solar flares. The ionisation and recombination coefficients are subsequently used to derive the ionisation equilibrium. To do so, we consider odd values of $n$ ranging from 1 to 19, i.e., from Maxwellian to strongly non-Maxwellian cases. These calculations involve all elements with proton number up to 30, i.e., H to Zn. The $n$ -distributions modify both the ionisation and the recombination rates. The ionisation rates decrease more steeply at lower pseudo-temperatures, while the radiative recombination rate is reduced due to a lower number of low-energy electrons. The peaks of the dielectronic recombination rates become narrower. These changes are reflected in the ionisation equilibrium. Ion abundance peaks become narrower and can also be shifted, mostly towards higher temperatures. The He-like ions are an important exception, as they are formed in a larger temperature range than that for the Maxwellian distribution. The ions Si xiii – xiv used previously for the diagnostics of the $n$ -distributions are affected only weakly, confirming the determination of $n$ . The ionisation equilibria are available as the electronic supplementary material in a format compatible with the CHIANTI database. |
| Databáze: | OpenAIRE |
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