“…That this is not the case, especially if we correlate two-month averages of the two activities, was shown by Bochnõ cek et al (1996). However this work is not the only attempt in this direction, for others including Roberts and Olson (1973) and Wilcox et al (1973), Bucha (1976Bucha ( , 1993, Py cha et al (1992), Bochnõ cek and Py cha (1994), Bochnõ cek et al (1996), indirectly Tinsley and Heelis (1993) and Tinsley (1996 a,b), in particular showed that geomagnetic activity can be a factor which, under certain conditions, might in¯uence the behaviour of the lower atmosphere.…”