Predictions of strengths of long-term variations in sunspot activity

Details Predictions of strengths of long-term variations in sunspot activity Predictions of strengths of long-term variations in sunspot activity

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...401l...9j&link_type=abstract

Astronomy and Astrophysics, v.401, p.L9-L12 (2003)

Astronomy and Astrophysics

Astrophysics

10

Sun: Rotation, Sun: Activity, Sun: Sunspots

Scientific paper

Recently, using Greenwich data (1879-1976) and SOON/NOAA data (1977-2002) on sunspot groups we found a big or a moderate drop in the solar equatorial rotation rate, A, occurred after every four solar cycles suggesting the existence of ``double Hale cycle (DHC)" and ``Gleissberg cycle (GC)" in A. We also found the existence of ``Hale cycle (HC)" and GC in the latitude gradient of the rotation, B (Javaraiah \cite{Javaraiah}). Using these results here we made forecasts for the following: (i) epochs of the forthcoming big and moderate drops in A; (ii) the epoch of maximum |B| during the current GC of B; (iii) the strengths of DHCs and HCs of sunspot activity which follow the big and the moderate drops in A; (iv) violation of the Gnevyshev & Ohl rule during the current HC 11 which consists of cycles 22 and 23; and (v) deduced the near complete absence of sunspot activity during the deep Maunder minimum.

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