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Reconstructing solar magnetic fields from historical observations - I. Renormalized Ca K spectroheliograms and pseudo-magnetograms

Alexei A. Pevtsov, Ilpo Virtanen, Kalevi Mursula, Andrey Tlatov and Luca Bertello

A&A, 585 (2016) A40

DOI: https://doi.org/10.1051/0004-6361/201526620

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