Yearly sunspots data 1700-2008
==============================

Description
-----------

Yearly (1700-2008) data on sunspots from the National
Geophysical Data Center.

Notes
-----

Number of Observations - 309 (Annual 1700 - 2008)
Number of Variables - 1
Variable name definitions::

    SUNACTIVITY - Number of sunspots for each year

The data file contains a 'YEAR' variable that is not returned by load.


Source
------

http://www.ngdc.noaa.gov/stp/SOLAR/ftpsunspotnumber.html

The original dataset contains monthly data on sunspot activity in the file
./src/sunspots_yearly.dat.  There is also sunspots_monthly.dat.


Copyright
---------

This data is public domain.
