On the unusual solar cycle 23

Details On the unusual solar cycle 23 On the unusual solar cycle 23

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh21b1929s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH21B-1929

Astronomy and Astrophysics

Astrophysics

[7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle

Scientific paper

We have analyzed the properties of the 27-day recurrence of solar activity, as represented by the Wolf number WN and the 10.7 cm radio flux F10.7. We study both a "shorter" period domain of the recurrence (from 25.0 to 27.3 days) and a "longer" one (from 27.3 to 31 days). In the "longer" period domain, the last solar cycle (23) is characterized by extremely low energy, at a level which is unprecedented since 1915. In the "shorter" period domain, the irregular behavior of cycle 23 manifests itself in the very low intensity, double peaked form of the energy of the absolute derivative of both WN and F10.7. Such features have not been observed since cycle 12, 140 years ago. We discuss how these unusual features of cycle 23 may affect attempts to reconstruct backwards UV/EUV emissions and also our understanding of future solar evolution and its impact on geomagnetism and climate.

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