2020
DOI: 10.48550/arxiv.2006.08971
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Helium line emissivities in the solar corona

G. Del Zanna,
P. J. Storey,
N. R. Badnell
et al.

Abstract: We present new collisional-radiative models (CRMs) for helium in the quiescent solar corona, and predict the emissivities of the He and He + lines to be observed by DKIST, Solar Orbiter, and Proba-3. We discuss in detail the rates we selected for these models, highlighting several shortcomings we have found in previous work. As no previous complete and self-consistent coronal CRM for helium existed, we have benchmarked our largest model at a density of 10 6 cm −3 and temperature of 20,000 K against recent CRMs… Show more

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“…This series of calculations was in part prompted by remarkable data from the more extended corona, in which the He I 1083 nm line has been observed to be brighter than predicted, even with recently updated atomic calculations (Del Zanna et al 2020). With Prof. J. R. Kuhn, the author is investigating ion-neutral and ion-dust-neutral dynamics in the inner heliosphere, following observational work obtained during total solar eclipses for more than two decades (Kuhn et al 1996;Mann & Kuhn 1998;Kuhn et al 2007;Moise et al 2010;Habbal et al 2018).…”
Section: Future Thoughtsmentioning
confidence: 99%
“…This series of calculations was in part prompted by remarkable data from the more extended corona, in which the He I 1083 nm line has been observed to be brighter than predicted, even with recently updated atomic calculations (Del Zanna et al 2020). With Prof. J. R. Kuhn, the author is investigating ion-neutral and ion-dust-neutral dynamics in the inner heliosphere, following observational work obtained during total solar eclipses for more than two decades (Kuhn et al 1996;Mann & Kuhn 1998;Kuhn et al 2007;Moise et al 2010;Habbal et al 2018).…”
Section: Future Thoughtsmentioning
confidence: 99%