ATMOSPHERIC ELECTRICITY IN HIGH LATITUDES. 

 TABLE VI. lonization. 



73 



The daily period of the ionizatiou is not so pronounced as that of the dissipation, 

 but the ionization is slightly lower in the evening than in the morning or at midday 

 during the whole year. There is practically no difference between the midday and 

 morning ionizations. The daily period of the ratio q is a steady rise from the morning 

 to the evening ; in this respect the ionization does not correspond with the 

 dissipation. 



Interrelation of the lonization, Dissipation and Potential Gradient. 



Potential Gradient and Dissipation. The relation between potential gradient and 

 dissipation has been very closely studied by GOCKEL* and ZOLSS. t The latter shows 

 that the potential gradient varies very considerably with the dissipation, high 

 potential gradient being accompanied by low values of the dissipation, and vice versa; 

 and both show very clearly that the ratio of negative dissipation to positive 

 dissipation rises considerably as the potential gradient rises. Table VII. shows the 



* 'Phys. Zeit.,'4, p. 871, 1903. 

 t 'Phys. Zeit.,'5, p. 106, 1904. 



VOL. OCV. A. 



