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Solar and Auroral Activities During the 17th Century

Published online by Cambridge University Press:  19 July 2016

J.P. Legrand ,
M. Le Goff ,
C. Mazaudier  and
W. Schröder
J.P. Legrand
Affiliation:
CNRS, 4 av. de Neptune, F-94107 Saint-Maur Cedex, France
M. Le Goff
Affiliation:
CNRS, Lab. de Geomagnetisme, 4 av. de Neptune, F-94107 Saint-Maur Cedex, France
C. Mazaudier
Affiliation:
CRPE, 4 av. de Neptune, F-94107 Saint-Maur Cedex, France
W. Schröder
Affiliation:
Hechelstr. 8, D-2820 Bremen-Rönnebeck, Germany

Extract

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The dark spots on the solar disk, some of them are visible with the naked eye, and the aurorae, especially those strectching down to the tropics, are the best visible manifestations of the solar activity. Since more than one century, we know that this activity follows a regular periodic cycle of 11-years (Heinrich Schwabe 1844), but with an intensity, which is sufficiently variable, to speak of “small” and “large” solar cycles.

Type
2. Long-Term Variability of the Solar Magnetic Cycle
Information
Symposium - International Astronomical Union , Volume 157: The Cosmic Dynamo , 1993 , pp. 109
Copyright
Copyright © Kluwer 1993 

References

Eddy, J.A.: 1976, Science 192, 1189.CrossRefGoogle Scholar
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Schröder, W.: 1984, in Das Phänomen des Polarlichts, (Auroral Borealis) , Wiss. Buchgesellschaft, Darmstadt.Google Scholar
Schröder, W.: 1992, J. Geomag. Geoelectr. 44, 119.CrossRefGoogle Scholar
Schwabe, H.: 1844, Astron. Nachrichten 21, 233.CrossRefGoogle Scholar