Hi Alejandra,
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Perhaps you’d like to first see a plot of the sunspot
numbers recorded since far back.
http://science.msfc.nasa.gov/ssl/pad/solar/images/ssn_yearly.jpg
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You can see there is a period of time when the Sun is very
inactive during about 1645 and 1700. That period is called the Maunder minimum,
when there looked like could be many years going by without a sunspot. The Sun
must have been very boring back then. But as you could also see, it seems to be
a very special period of time since we have sunspot records. In recent years,
things are looking pretty different. Take the last solar minimum, year 1996, as
an example, the longest period without any sunspots is something like six
weeks. You may also take a look at this NOAA data page for yourself at
ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SUNSPOT_NUMBERS/1996
<!--[if !supportEmptyParas]--> Yan
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