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In reply to tusenfem: I have looked through the Ae index given here and I do not see anything unusual about it. So, magnetospherically there is nothing different. Also, IMHO, Ap and AA indices are not really very useful in describing the disturbance of the Earth's magnetosphere. In my 8 years or Earth magnetospheric work I have not used these indices in any of my papers.
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Based on how the cloud modulation mechanism “electroscavenging” works (see comment) the geomagnetic index to measure to determine if there is correlation is Ak rather than AA.
Paper by Georgieva, Bianchi, & Kirov “Once again about global warming and solar activity”
http://sait.oat.ts.astro.it/MSAIt760.....76..969G.pdf
From that above paper:
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"It has been noted that in the last century the correlation between sunspot number and geomagnetic activity has been steadily decreasing from - 0.76 in the period 1868-1890 to 0.35 in the period 1960-1982, ... According to Echer et al (2004), the probable cause seems to be related to the double peak structure of geomagnetic activity. The second peak, related to high speed solar wind from coronal holes, seems to have increased relative to the first one, related to sunspots (CMEs) but, as already mentioned, this type of solar activity is not accounted for by sunspot number. In figure 6 long term variations in global temperature are compared to the long-term variations in geomagnetic activity as expressed by the ak-index (Nevanlinna and Kataga 2003). The correlation between the two quantities is 0.85 with p< 0.01."
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Comment
1) The electroscavenging mechanism is controlled by changes in the ionosphere space charge which changes the global electric current. According to Tinsley an increase in the global electric current, results in the removal of cloud forming ions. Palle's satellite research data and analysis supports Tinsley's assertion.
2) Average land + ocean temperature appears to have dropped 0.5C, March, 2007 March to Feb. 2008.
3)The largest drop in temperature (March,2007 to Feb.,2008) has been in ocean surface temperature which supports the assertion that the change in planetary temperature is caused by a sudden increase in low level clouds, due to an abrupt drop in electroscavenging (electroscavenging removes cloud forming ions) and an abrupt increase in GCR (GCR creates cloud forming ions), as the atmosphere over the ocean is ion poor.