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Sunspots and the Number of Groups - Implications For Geomagnetic Activity During Grand Solar Minimum

2,011 views · Published 7 October 2017 · 4:57 · Indexed 7 October 2026

Channel: Oppenheimer Ranch Project · 2017 · People & Blogs

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Recent discoveries in solar dynamics suggest that sunspot activity may actually increase during grand solar minimum in the form of more numerous small sunspot groups as the number of large sunspot groups diminish.

Data from three solar observatories, Learmonth, Holloman, and San Vito, are used to study the variations in the average number of sunspots per sunspot group. It is found that the different types of sunspot groups and the number of sunspots in these groups have different solar cycle and cycle to cycle variations. The varying ratio between the average number of sunspots and the number of sunspot groups is shown to be a real feature and not a result of changing observational instruments, observers experience, calculation schemes, etc., and is a result of variations in the solar magnetic fields. Therefore, the attempts to minimize the discrepancies between the sunspot number and sunspot group series are not justified, and lead to the loss of important information about the variability of the solar dynamo.
https://arxiv.org/ftp/arxiv/papers/1710/1710.01775.pdf

http://icelandmonitor.mbl.is/news/nature_and_travel/2017/10/07/northern_lights_to_dwindle_in_2019/

https://www.thrillist.com/news/nation/northern-lights-forecast-fading-solar-cycle

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