Free Access
Erratum
This article is an erratum for:
[https://doi.org/10.1051/0004-6361/201834296]


Issue
A&A
Volume 652, August 2021
Article Number C7
Number of page(s) 1
Section The Sun and the Heliosphere
DOI https://doi.org/10.1051/0004-6361/201834296e
Published online 24 August 2021

In our paper, we made a mistake in calculating the magnetic flux values. The penumbra starts with a value of 1.32 × 1021 Mx on August 29, 2011, and decreases to 0.58 × 1021 Mx on September 3, 2011. The umbra has an initial value of 0.90 × 1021 Mx and ends with a value of 0.55 × 1021 Mx. The corrected values for the penumbra now more likely have a quadratic trend, although we do not exclude a linear one. The new curves are displayed in Fig. 1, which replaces Fig. 4 in the original paper.

thumbnail Fig. 1.

Temporal evolution of the magnetic flux in umbra (blue dots) and penumbra (red dots). The data from August 28 are excluded from the fits because on that day the spot was still in the growing phase.

Acknowledgments

We are indebted to Dr. Mariarita Murabito for bringing the problem to our attention.


© ESO 2021

All Figures

thumbnail Fig. 1.

Temporal evolution of the magnetic flux in umbra (blue dots) and penumbra (red dots). The data from August 28 are excluded from the fits because on that day the spot was still in the growing phase.

In the text

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