Table I. (6) (l).—Fourier Coefficients of the Solar Diurnal Magnetic Variation at the Equinoxes. 
( b ) Sunspot Minimum, 1902. 
(l) The 24-hour Component. 
DIURNAL VARIATIONS OF TERRESTRIAL MAGNETISM 
75 
Radial. 
Autumn. 
lO 05 
i—H 
1 1 
i> ^ co 
r—H 
1 1 
04 04 
r-H r-H 
1 
so 
r-H 
1 
r-H 
- 6 
-39 
o 
r-H 
1 
4^ 
04 
1 
pH SO 
1 
SO r-H 
04 
1 i 
Spring. 
pH tO 
r— ( r— 1 
1 1 
04 pH 1—< 
r-H 
1 1 
id ZD 
1 
05 
r-H 
1 
pH 
I 
0 
- 36 
Autumn. 
' — i id 
05 so 04 
04 H CO 
SO LO 
CO co 
26 
58 
67 
82 
- 55 
LO 05 
SO 
1 1 
Spring. 
4— Id 
1 
h(MtH 
CO 04 04 
i 
LO LO 
pH co 
32 
72 
r-H 04 
pH 00 
- 67 
pH SO 
SO 
r—H 
1 1 
North. 
. ' _ 
r-O 
Autumn. 
CO CO to 
04 SO 04 
05 04 00 
i—i pH Ol 
to o 
CO 
pH CO 
CO CO 
pH r-H 
00 r-H 
to so 
pH 04 
1 1 
- 65 
LO 04 
pH 04 
1 
Spring. 
ZD SO LO 
pH 
pH pH pH 
1 
OO so 
r-H 
1 1 
SO 00 
CO r-H 
4— co 
to 
1 
-40 
-19 
SO 
pH 
1 
lO o 
r—H 
S3 
Autumn. 
CO O 00 
05 ZD LO 
1 1 1 
O c£> 
O 50 i—I 
r-H r-H 
1 1 1 
05 co 
LO CO 
1 1 
pH £■— 
05 05 
1 1 
O 05 
to 04 
05 LO 
04 l'- 
r-H r—1 
144 
SO to 
pH 
1 
Spring. 
OlON 
4^ LO pH 
1 1 1 
pH 04 4^ 
ZD i O 00 
1 1 1 
05 04 
r—H r-H 
1 
r-H 
so 
1 1 
CO LO 
r-H L— 
r-H U— 
pH 05 
!—H r-H 
t—H 
SO 
r—H 
4— SO 
CO 05 
1 
West. 
1-0 
Autumn. 
i>- 4— X>- 
4^ 05 GO 
^ O CO 
1> 05 
LO 00 
00 go 
CO LO 
■00 05 
lO to 
04 00 
r-H 
lO OJ 
00 
pH 
1 
r—H r—H 
00 4~— 
1 1 
Spring. 
ZD J>- CO 
pH O tO 
r-H 
SO 04 00 
pH SO pH 
r-H lO 
LO LO 
SO 00 
so so 
O 05 
r-H SO 
1 
00 pH 
r-H 
04 
00 
1 
- 114 
- 106 
S3 
Autumn. 
ZD pH O 
N 0 1> 
pH 05 pH 
00 CO SO 
LO 00 
>00 4- 
4— SO 
LO LO 
04 r-H 
r-H 04 
44 
60 
50 
co CO 
CO r-H 
1 1 
Spring. 
ZD 04 r-H 
pH tO pH 
U- OO 4— 
Id pH pH 
00 05 
LO CO 
to co 
pH pH 
04 LO 
co 
SO SO 
t-H 
1 
LO 
r—H 
1 
04 O 
lO i— 1 
1 1 
Observatory 
No. 
I—1 04 co 
1 -sH lO to 
4^ 00 
05 O 
r—H 
r-H 04 
r—H i—H 
CO pH to 
r-H r-H r—H 
1 
SO i>- 
r-H r—H 
00 05 O 
pH r-H 04 
Group No. 
h-H 
HH 
>— i 
1—1 
l-H 
> 
HH 
£ 
TIA 
IIIA 
