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DC Field | Value | Language |
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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 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Predictions of strengths of long-term variations in sunspot activity | 168.01 kB | Adobe PDF | View/Open |
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