REVISITED SUNSPOT DATA: A NEW SCENARIO FOR THE ONSET OF THE MAUNDER MINIMUM
- Departamento de Fisica, Universidad de Extremadura (Spain)
- Sodankylae Geophysical Observatory (Oulu unit), University of Oulu (Finland)
The Maunder minimum forms an archetype for the Grand minima, and detailed knowledge of its temporal development has important consequences for the solar dynamo theory dealing with long-term solar activity evolution. Here, we reconsider the current paradigm of the Grand minimum general scenario by using newly recovered sunspot observations by G. Marcgraf and revising some earlier uncertain data for the period 1636-1642, i.e., one solar cycle before the beginning of the Maunder minimum. The new and revised data dramatically change the magnitude of the sunspot cycle just before the Maunder minimum, from 60-70 down to about 20, implying a possibly gradual onset of the minimum with reduced activity started two cycles before it. This revised scenario of the Maunder minimum changes, through the paradigm for Grand solar/stellar activity minima, the observational constraint on the solar/stellar dynamo theories focused on long-term studies and occurrence of Grand minima.
- OSTI ID:
- 21562737
- Journal Information:
- Astrophysical Journal Letters, Vol. 731, Issue 2; Other Information: DOI: 10.1088/2041-8205/731/2/L24; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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