Spectral gradient of the thermal millimetre continuum as a diagnostic for optical thickness in the solar atmosphere (Corrigendum)

A. S. Rodger; N. Labrosse

doi:10.1051/0004-6361/201833848e

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A&A, 623 (2019) C3

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Erratum

This article is an erratum for:
[https://doi.org/10.1051/0004-6361/201833848]

Issue		A&A Volume 623, March 2019


Article Number		C3
Number of page(s)		1
Section		Letters to the Editor
DOI		https://doi.org/10.1051/0004-6361/201833848e
Published online		22 March 2019

A&A 623, C3 (2019)

Letter to the Editor

Spectral gradient of the thermal millimetre continuum as a diagnostic for optical thickness in the solar atmosphere (Corrigendum)

A. S. Rodger and N. Labrosse

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK

Key words: radiation mechanisms: thermal / Sun: atmosphere / Sun: filaments, prominences / errata, addenda

Erratum for: A&A, 617, L6 (2018), https://doi.org/10.1051/0004-6361/201833848

In our article (Rodger & Labrosse 2018) a small factor of $\frac{π}{\sqrt{3}}$ $\frac{\pi}{\sqrt{3}}$ is missing from Eq. (1). The correct expression for the absorption coefficient from thermal bremsstrahlung should read: $\begin{matrix} κ_{ν} = 1.77 \times 10^{- 2} \frac{n_{e}}{ν^{2} T^{3 / 2}} g_{ff} \sum_{i} Z_{i}^{2} n_{i} . \end{matrix}$ $\begin{aligned} \kappa _{\nu } = 1.77\times 10^{-2}\frac{n_{\rm e}}{\nu ^2T^{3/2}}g_{\mathrm{ff} }\sum _i Z_i^2n_i. \end{aligned}$ (1)

The omission of the $\frac{π}{\sqrt{3}}$ $\frac{\pi}{\sqrt{3}}$ term in the published study does not change our analysis or the conclusions which we draw.The spectral gradient does not depend on it and thus the results from the models given in our analysis show simply a case with slightly lower optical thickness than would be expected.

References

Rodger, A. S., & Labrosse, N. 2018, A&A, 617, L6 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]

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[1] Rodger, A. S., & Labrosse, N. 2018, A&A, 617, L6 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]