dc.contributor.author |
Javaraiah, J |
|
dc.date.accessioned |
2008-09-23T15:06:15Z |
|
dc.date.available |
2008-09-23T15:06:15Z |
|
dc.date.issued |
2003-04 |
|
dc.identifier.citation |
Astronomy and Astrophysics, Vol. 401, No. 2, pp. L9 - L12 |
en |
dc.identifier.issn |
0004 - 6361 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/3850 |
|
dc.description.abstract |
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. |
en |
dc.language.iso |
en |
en |
dc.publisher |
The European Southern Observatory |
en |
dc.relation.uri |
http://dx.doi.org/10.1051/0004-6361:20030272 |
en |
dc.rights |
© The European Southern Observatory |
|
dc.subject |
Sun:Rotation |
en |
dc.subject |
Sun:Activity |
en |
dc.subject |
Sun:Sunspots |
en |
dc.title |
Predictions of strengths of long-term variations in sunspot activity |
en |
dc.type |
Article |
en |