
TY  - JOUR
A1  - Petersons, HF 
T1  - Disturbance Daily Variation During the IGY
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1970
VL  - 23
IS  - 5
SP  - 905
EP  - 926
KW  - 
UR  - https://doi.org/10.1071/PH700905 
N2  - The disturbance daily variation field SD, was studied for the three seasons using lGY data from 50 observatories. Equivalent external and internal electric current systems which could account for the SD field were obtained by the method of spherical harmonic analysis. The external current systems were found to be only approximately symmetrical about the geomagnetic equator 
ER  -

