Transition of the Sunspot Number from Zurich to Brussels in 1980: A Personal Perspective

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• 作者：J. O. Stenflo
• 关键词：Sunspots ; Statistics ; Solar Cycle ; Observations
• 刊名：Solar Physics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：291
• 期：9-10
• 页码：2487-2492
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Astrophysics and Astroparticles; Atmospheric Sciences; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics);
• 出版者：Springer Netherlands
• ISSN：1573-093X
• 卷排序：291

文摘

The Swiss Federal Observatory, which had been founded in 1863 by Rudolf Wolf, was dissolved in connection with the retirement of Max Waldmeier in 1979. The determination of the Zurich sunpot number, which had been a cornerstone activity of the observatory, was then discontinued by ETH Zurich. A smooth transition of the responsibility for the sunspot number from Zurich to Brussels was achieved in 1980, however, through which it was possible to avoid a discontinuity in this important time series. Here we describe the circumstances that led to the termination in Zurich, how Brussels was chosen for the succession, and how the transfer was accomplished.