The maximum of this next cycle measured in terms of sunspot number
, a standard measure of solar activity level could be 30 to 50% lower than the most recent one.
Moreover, on July 1, 2015, the sunspot number
series was replaced by a new improved version (version 2.0) to include several corrections of past inhomogeneities in the time series.
The smoothed monthly mean sunspot number
time series in this paper comes from the data analysis center of the Sun Observatory of Belgium (http://sidc.oma.be/silso/datafiles).
Caption: HOW SUNSPOT NUMBERS
CHANGE WITH TIME Scientists use monthly averages of the International Sunspot Number
(shown), itself a statistical combination of many observations, to track the solar cycle.
Sunspot Cycle Characteristics Based on the Newly Revised Sunspot Number
, Journal of the Alabama Academy of Science 86(3/4), pp.
In , tight wavelet neural network is used to predict sunspot number
. Wavelet neural network is used to predict the charge load in .
This is due to the seasonal changes in the neutral atmosphere (as mentioned previously), as well as the high sunspot number
of the months April and October.
The sunspot number
was taken into consideration (Sunspot data files 2013).
Wilcox, "Using dynamo theory to predict the sunspot number
in solar cycle 21," Geophysical Research Letters, vol.
But unlike Earth's, the sun's magnetic poles flip every 11 years or so, just as the sunspot number
The citation of the Sunspot award reads: "For a cumulative contribution since 1999 of 1 500 sunspot observations in support of the American Relative Sunspot Number
program and service to the AAVSO Solar observing program."
This cycle peaked in 1957 with a yearly sunspot number
of 190, just at the time that the first space physics satellites were being launched (Odenwald et al.