UK aa-index from 1868 to Nov 15, 2014

The graph below shows the Geomagnetic AA-index recorded by the UK Solar System Data Centre from 1868 to present.

The link to the UK Solar System Data Centre is: http://www.wdc.rl.ac.uk/Help/aa.html

The data retrieval form is at the following link
http://www.wdc.rl.ac.uk/cgi-bin/wdcc1/secure/geophysical_parameters.pl

You’ll have to do a quick sing up before retrieving the data.

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