Cosmic Physics Research Articles

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52 Articles

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Sampling of condensation nuclei by means of a mobile photo-electric counter

A motor van was equipped with an improved photo-electric nuclei counter and samples of condensation nuclei were taken during travels in Ireland on 19 days. Nuclei measurements were made at 15 places in the Dublin area and at 19 stations during two traverses of Ireland and at the Atlantic Coast. The new model of the counter and its accessories are described in detail and a working drawing of the counter given in order to facilitate standardisation and to enable the users to apply the same calibration table which may be obtained on request from the School of Cosmic Physics. The mobile laboratory used in the nuclei survey of Ireland is depicted and both its equipment and the procedure of measurement during travel, including the necessary precautions and possible sources of error, are discussed.

Archiv für Meteorologie, Geophysik und Bioklimatologie Serie A

Apr 1, 1952
L W Pollak + 1

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Experimental Investigations of Magneto-Hydrodynamic Waves

The importance of magneto-hydrodynamic phenomena to different parts of cosmic physics is becoming more and more evident. This fact and the extreme mathematical difficulties involved in an exact treatment of many problems make it necessary to consider the possibility for experimental investigations. In this paper the fundamental equations are solved for cylindrically limited waves, a case which seems to be best adapted for experiments. It is shown that an ideal magneto-hydrodynamic wave in a liquid with finite conductivity can exist only in a certain frequency interval. The upper limit is set by the conductivity and the magnetic field strength. Above this value the waves degenerate into skin-waves. The lowest frequency is determined by the geometrical dimensions and by the conductivity. Waves in different liquids are compared, and liquid sodium is found to be the best medium for an experiment. A brief account is given for a preliminary experiment and other investigations are proposed.