In a recent publication we investigated the dependence of the (smoothed) Northern Hemisphere average ground temperature on the (also smoothed) sun’s polar and equatorial magnetic field fluxes.
The reference to the paper is: Jager C de, Nieuwenhuizen ACT, Nieuwenhuijzen H, Duhau S: The relation between the average northern hemisphere ground temperature and the solar polar and equatorial magnetic activity. Phys. Astron. Int. J. 2018, 2(3) 175 – 185, DOI: 10,15406/paij. 2018.02.00083
The full paper can be read at http://medcraveonline.com/PAIJ/PAIJ-02-00083.pdf
We summarize the main results:
— While it is conventionally assumed that the equatorial magnetic fields (the sunspot environment) is a strong contributor to terrestrial climate, we find that the polar field also contributes significantly. The relative fractions are even comparable: 43% and 32%
— There is also a still unexplained but also significant non-magnetic component of 25%
— The modern temperature increase , usually assumed to have started together with the industrial revolution (hence in the 19th century or even earlier) appears to be only significant after 1915 – 1920 (cf. Figs 6 and 7). Since that time the temperature excess over the expected solar contribution has increased by 0.9 degrees
— The flattening of the increase of the modern temperature during the decade after about the year 2000 is ascribed to the low solar activity at that time (figs. 11 and 12)
— We forward our expectation that the actual period of relatively low solar activity will continue during the present millennium (Fig. 11 and relevant text)
— We present evidences that both the solar activity and the average terrestrial northern hemisphere ground temperature have a weak 2300 years (most probably Hallstatt) component (Figs 8 – 10)
