Abstract
Tropospheric temperature and pressure fields on the Northern Hemisphere in the winter periods 1952-1996 were investigated. Composite maps of those fields, created for the high and low geomagnetic activity and individual quasi-biennial oscillation (QBO), phases show clear differences not only between different levels of geomagnetic activity, but also between the two phases of QBO. Special attention was given to the behaviour of the lower troposphere in January and February 1982.Key words. Geomagnetism and paleomagnetism (time variations · diurnal to regular). Meteorology and atmospheric dynamics (general circulation; middle atmosphere dynamics)
Highlights
The work aims at ®nding whether there exist distributions of temperature and pressure ®elds which could be regarded as distributions typical of the given quasi-biennial oscillation (QBO) phase and level of geomagnetic activity
If we examine the character of these formations in connection with QBO phase and the level of geomagnetic activity we will ®nd the Siberian anticyclone remains almost independent of these parameters
If we analyse the distribution of temperature deviations, we see (Fig. 3) that at the Euro-Asian continent the relatively mild winter periods are associated with high geomagnetic activity, this being so, regardless of the QBO phase
Summary
The work aims at ®nding whether there exist distributions of temperature and pressure ®elds which could be regarded as distributions typical of the given QBO phase and level of geomagnetic activity. In connection with the level of geomagnetic activity and QBO phase the set of temperature and pressure composite maps shows evident dierences. The fact that the inuence of geomagnetic activity has been underestimated in the past, was probably caused by the opinion that the solar and the geomagnetic activity were so closely correlated that the study of the inuence of geomagnetic activity necessarily appeared superuous. 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). This work is not the only attempt in this direction, for others including Roberts and Olson (1973) and Wilcox et al (1973), Bucha (1976, 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 inuence the behaviour of the lower atmosphere
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