Issue |
A&A
Volume 457, Number 1, October I 2006
|
|
---|---|---|
Page(s) | 309 - 312 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20064837 | |
Published online | 12 September 2006 |
A prediction of the onset of solar cycle 24
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China e-mail: zldu@bao.ac.cn
Received:
11
January
2006
Accepted:
15
May
2006
Aims.This paper aims to search for a method to estimate the onset of a new solar cycle by re-investigating the relationship between descending and ascending phase durations in terms of weighted extremum times.
Methods.The lagged cross-correlation method is used to analyze their relationship.
Results. The descending phase durations are found to be anti-correlated (correlation coefficient, -0.77)
with the ascending phase
durations three cycles earlier,
in the 13-month running mean sunspot numbers since cycle 8.
From linear regression analysis,
the descending phase duration of cycle 23 is estimated to be
months;
thus, cycle 24 should start near March 2007, where the error bar equals ± standard error.
Key words: Sun: activity / Sun: sunspots / Sun: general
© ESO, 2006
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