Chromospheric backradiation in ultraviolet continua and Halpha

Details Chromospheric backradiation in ultraviolet continua and Halpha Chromospheric backradiation in ultraviolet continua and Halpha

2012-03-02

arxiv.org/abs/1203.0396v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted by Astron. Astrophys. The year in each citation is a clicker for on-screen (pdf or html) reading which browser-opens

Scientific paper

A recent paper states that ultraviolet backradiation from the solar transition region and upper chromosphere strongly affects the degree of ionization of minority stages at the top of the photosphere, i.e., in the temperature minimum of the one-dimensional static model atmospheres presented in that paper. We show that this claim is incompatible with bservations and we demonstrate that the pertinent ionization balances are instead dominated by outward photospheric radiation, as in older static models. We then analyze the formation of Halpha in the above model and show that it has significant backradiation across the opacity gap by which Halpha differs from other strong scatttering lines.

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