Josef Bochníček

Association Between Extraterrestrial Phenomena And Weather Changes In The Northern Hemisphere In Winter

This paper includes a discussion of the validity of theobjections which are usuallyraised against the physical plausibility of the correlationsbetween extraterrestrialphenomena and changes in circulation in the lower atmosphere.The behaviour of the winterlower troposphere in the Northern Hemisphere was analysed bothon a month-to-month timescale and on a day-to-day time scale. The mechanisms which cansatisfactorily explainthe behaviour of the winter lower troposphere on these timescales have been described.The basic features of the results presented were explained bymeans of a mechanism basedon the propagation of planetary waves. Attention was focussedon studying the connectionsamong the changes in the pressure and temperature fields, thechanges in solar/geomagnetic activity and QBO phases by the method of composites. It hasbeen found that the compositeswithout considering QBO phases are similar to the QBO-eastpatterns under the highestactivities. Pressure deviations during QBO-west high solaractivity or low geomagneticactivity and temperature deviations during QBO-east/west lowgeomagnetic activity provedto be of negligible statistical significance.

Relation between Northern Hemisphere winter temperatures and geomagnetic or solar activity at different QBO phases

Abstract In our previous work a dominant coupling was shown between solar and geomagnetic activity, and surface air temperature of the QBO-west and east phases, respectively. The aim of the present study is to define ‘typical’ regions of positive and negative deviations from the long-term temperature average, to determine their magnitude and to find the conditions under which such a ‘typical’ distribution of temperature fields occurs.

COMPARISON OF SOLAR AND GEOMAGNETIC ACTIVITY EFFECTS ON THE NORTHERN HEMISPHERE WEATHER CHANGES

The changes of pressure and temperature fields in the winter lower troposphere observed in association with changes in solar and/or geomagnetic activity are compared. It is shown that the fact whether it was solar or geomagnetic activity was not so important as whether the levels of the two activities were high or low. The differences between the effects of solar/geomagnetic activity, however, are revealed, the pressure and temperature data being stratified according to the QBO phase. The relationship obtained are discussed from the viewpoint of mechanisms resting upon both the planetary wave propagation and the changes of atmospheric air currents in the global electric circuit.

THE EFFECT OF GEOMAGNETIC AND SOLAR ACTIVITY ON THE DISTRIBUTION OF CONTROLLING PRESSURE FORMATIONS IN THE NORTHERN HEMISPHERE IN WINTER

The distribution of controlling pressure formations, occurring in the Northern Hemisphere during the winters (January and February) of the years 1952 – 1996, has been analysed. It was found that the deepening of the Icelandic and Aleutian pressure lows is connected not only with a particular QBO phase and level of geomagnetic activity (Bochníček et al., 1999) but also with a particular level of solar activity.

A possible relation between geomagnetic activity and winter air surface temperatures in Prague

SummaryA possible relation between the 10-day geomagnetic activity, solar activity and temperatures as measured at the meteorological station Prague - Klementinum in 1932–1975 was sought. It was found that: 1) ΣKp correlates with the surface temperature in Prague substantially better than Wolfs number R. 2) The correlation between ΣKp and the surface air temperature is not very close, but is significant at the level p=0.9! 3) If the QBO phase is taken into account, the correlations for the January and February decades of the years 1956–1975 improve as in [27] (van Loon, Labitzke).

Geomagnetic activity as a possible cause of changes in the middle atmosphere and troposphere; observations made in Prague in the years 1932–1987

SummaryA possible relation between the 10-day, 1-month, and 2-month geomagnetic as well as solar activity, characterized by ΣKp and Wolfs number R, and temperatures measured at the Prague-Klementinum meteorological station in January–February of the years 1932–1987 was sought. It was found that:1) ΣKp correlates with the temperature in Prague better than Wolfs number R.2) If the QBO phase is taken into account, the correlations improve.3) Even if the correlations improves with increasing length of the subintervals into which the individual winter periods (January-February) were derived, their statistical significance declines.

The determination of the field intensity of a magnetodynamic disturbance in the lower ionosphere from the field intensity measured above the Earth's surface

РезюмеСначала была выведена формула для волнового вектора в сильно затухаюшей среде. В третей части выводятся формулы для интенсивностей преломленных магнетогидродинамических волн. Было показано, что угол падения должен быть комплексным и рассматриваются некоторые предельные случаи.

A contribution to the measurement of frequency dependence of electrical conductivity of rocks

SummarySome errors of method occurring in A. C. measurements of the electrical conductivity of rocks are discussed. It is demonstrated that the difference between A.C. and D.C. conductivities, at given frequency, depends mostly on the magnitude of the D.C. conductivity and magnitude of the dielectric constant.

Modelling of the sensing system of a vibrational magnetometer by digital computer

SummaryAn analytico-numerical computation of the transfer function of the sensing system of a vibrational magnetometer is presented. In discussing the results, the properties of the method are pointed out and a proposal for the sensing system is made with regard to the required sensitivity of the instrument.

A comment on determining the induced magnetic field in bodies of arbitrary shape

SummaryThe authors prove that the solution of Laplaces equation under Neumanns boundary conditions can be transformed to an advantage into determining the field which is generated by charges, induced by the external field at surfaces of discontinuity.