Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980lastr..94..417s&link_type=abstract
L'Astronomie, vol. 94, Oct. 1980, p. 417-430. In French.
Astronomy and Astrophysics
Astronomy
Geomagnetism, Solar Activity, Solar Activity Effects, Solar Cycles, Solar Terrestrial Interactions, Prediction Analysis Techniques, Solar Atmosphere, Solar Corona, Solar Magnetic Field, Sunspots
Scientific paper
The solar activity cycle is discussed with regard to the use of sunspot numbers as the accepted index of solar activity. Following a review of the formulation of the relative sunspot number by Wolf in 1849 and of the importance of solar activity prediction, attention is given to means of prediction based on records of relative sunspot numbers extending back to 1700. The global displacement of solar magnetic field from the poles to the equator which is the source of solar activity is examined, and relations between the families of intense bipolar fields in the lower regions of the solar atmosphere (activity centers), large regions of weak field responsible for coronal holes, and the various forms of solar activity are considered, including effects on geomagnetic activity indexes. New means of solar cycle prediction based on geomagnetic indexes or direct weak-field measurements are then presented. It is pointed out that the discovery of events such as the coronal transients observed by OSO 7 and Skylab may lead to the modification of current understandings of the relative importance of the various manifestations of solar activity.
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