Element 



Space-charge, over land 



TABLE 653.— ATMOSPHERIC-ELECTRIC DATA (concluded) 



Symbol 

 P 



617 



(For h = height in km) 



Mobility of small ions : 

 Positive 



Negative 



Rate of formation of 

 ion-pairs 



fe + 



X./300 en. 



* The sign and magnitude of surface values are exceedingly variable from place to place. 



SMITHSONIAN PHYSICAL TABLES 



