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Article
Open AccessRecalibration of the Sunspot-Number: Status Report
We report progress on the ongoing recalibration of the Wolf sunspot number ( S N ...
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Article
Preface to Topical Issue: Recalibration of the Sunspot Number
This topical issue contains articles on the effort to recalibrate the sunspot number (SN) that was initiated by the Sunspot Number Workshops. These workshops led to a revision of the Wolf sunspot number (WSN) ...
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Article
Open AccessIntroduction to the special issue on history development of solar terrestrial sciences including auroral sub-storms
Solar terrestrial (ST) sciences started centuries ago and branched into different disciplines. Starting with naked eye to highly sophisticated novel experimental techniques, observations have revealed the secr...