328 
TERRESTRIAL AND SOLAR RELATIONS 
upon ionization in the lower strata, and not upon any system of 
ionization currents in the upper strata, as has been claimed. 
Besides the vector directions of the magnetic forces we may 
approximately obtain the forces by the formula, 
(741) A H = 4 t e n + u + , 
where e = 3.4 X 1(T 10 , n + — the number of positive ions per 
cubic centimeter, and ti + the velocity of the circulation in centi 
meters per second. The available data for the level 400 meters 
are probably approximately as follows, in the South Temperate 
zone: 
TABLE 75 
The Deflecting Magnetic Vectors as Computed and Observed 
AH = 4 n e n u in C. G. S. units. 
A.M. 
Formula 
0 
2 
4 
6 
8 
10 
47T 
12.56 
e 
3.4X1CT 10 
n+ 
1045 
1226 
1374 
1284 
1245 
1223 
U _j_ 
35 
38 
40 
36 
34 
46 
AH 
.00016 
.00020 
.00023 
.00028 
.00018 
.00024 
Observed 
.00019 
.00017 
.00020 
.00024 
.00028 
.00026 
P.M. 
Formula 
0 
2 
4 
6 
8 
10 
4 7T 
. 
e 
n + 
1195 
1232 
1287 
1225 
1242 
1274 
u + 
75 
70 
55 
50 
45 
38 
AH 
.00038 
.00037 
.00030 
.00026 
.00024 
.00021 
Observed 
.00028 
.00030 
.00028 
.00020 
.00017 
.00018 
The number of ions per cubic centimeter was obtained at 
the surface at Daroca and Guelma, 1905, and from the other 
available published data; the velocity of the moving medium 
in cms/sec. was adopted from the study of the Argentine data. 
The results are so far in harmony with the observed A H = s of 
Table 74, South Temperate zone, equivalent approximately to