Zitat:
Zitat von BlinderBarmer
Preisfrage, was bedeutet eigentlich die Vorsilbe Geo, wie z.B. in Geomagnetismus, etwas was im aa-index dargestellt wird und die laut dir die Sonnenaktivität darstellen soll?
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Schau doch mal in die Links rein, der aa Index ist die übliche Messgröße zur Abbildung der (magnetischen) Sonnenaktivität. Oder auch die TSI, das korreliert recht gut. Während Sonnenfleckenzahl zu ungenau ist.
Aus
SOLAR MAGNETIC FIELDS AND TERRESTRIAL CLIMATE:
Conclusion
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It should be noted that solar electromagnetic radiation is only one of the solar agents affecting climate. Another one is the solar wind – the ever expanding solar corona filling the whole heliosphere with solar plasma and embedded magnetic fields. Its role in climate change is a subject of extensive research, but is not yet fully understood, and its contribution is included in only a few atmospheric models. But it has been found that Earth's surface temperature is correlated with both decadal averages and solar cycle minimum values of the geo-magnetic activity [22] which are determined by the solar wind parameters [23]. The solar cycle minimum values of the geomagnetic activity aamin (geomagnetic activity floor) and b (rate of increase of geomagnetic activity with increasing sunspot numbers) both have secular periodic variations (Fig.5) which make it possible to forecast their future variations. The expected decrease in aamin means decrease in surface temperature in the next decades. On the other hand, aamin is proportional to sunspot magnetic field in cycle minimum, which is positively correlated with cycle averaged TSI, and b is proportional to the rate of increase of sunspot magnetic fields with increasing sunspot number which is negatively correlated to TSI. Therefore, the expected decrease of aamin and increase of b both predict future decrease of TSI which, added to the expected decreasing geomagnetic activity, will be an additional factor for the future global cooling.