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| Titel |
A brief review on the presentation of cycle 24, the first integrated solar cycle in the new millennium |
| VerfasserIn |
K. J. Li, W. Feng, H. F. Liang, L. S. Zhan, P. X. Gao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 2 ; Nr. 29, no. 2 (2011-02-15), S.341-348 |
| Datensatznummer |
250016972
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| Publikation (Nr.) |
 copernicus.org/angeo-29-341-2011.pdf |
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| Zusammenfassung |
| The status of the extended solar activity minimum, since the second half of
2007, has been briefly instructed to the solar-terrestrial community.
Cycle 24 has the most spotless days since cycle 16, and probably even since
the modern cycles, latitudes of high-latitude (>35°) sunspots
belonging to a new cycle around the minimum time of the cycle are
statistically the lowest at present, compared with those of cycle 12 onwards,
and there is only one or no sunspots in a month appearing at high latitudes
(>20°) for 58 months (from November 2003 to September 2008), which is
observed for the first time since cycle 12 onwards. The solar wind velocity and
pressure, 10.7 cm solar radio flux, the polar solar magnetic field, solar
total irradiance, and so on reach their minima during the 23–24 cycle minimum
time. In order to explain the present extreme low activity, we introduced here
one possible mechanism using helio-seismology observations. Viewing, from the
long-term running of the time scales of both the Gleissberg period and
millenniums, the extended solar activity minimum becomes logical. According
to the present observations, the cycle 24 should start in November 2008.
Solar activity is predicted at being about 30% lower in cycle 24 than in
cycle 23, synthesizing the typical predictions of solar activity, including
those given by NASA and NOAA. The 24th solar cycle is sluggishly coming and
it should be an opportune moment for studying solar physics and
solar-terrestrial physics. |
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