ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] The solar activity, expressed as the sunspot number, has been recorded consistently since 1843, when Schwabe discovered the 11 -yr cycle. Earlier data can be reconstructed from historical documents3"5 containing references to auroral events as well as mentioning sunspot activity. Although much ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/347164a0
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