
TY  - JOUR
A1  - Hibberd, FH 
T1  - Day-to-Day Variability of the Sq Geomagnetic Field Variation
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1981
VL  - 34
IS  - 1
SP  - 81
EP  - 90
KW  - 
UR  - https://doi.org/10.1071/PH810081 
N2  - Much apparent day-to-day variability in the H component of the Sq variation in low and middle latitudes is not due to a variability in ionospheric currents, but arises from contamination by often unrecognized disturbance field variations associated with distant agnetospheric currents. There appears to be little, if any, day-to-day variability in the shape, type or phase of the pure Sqvariation. There is, however, a substantial day-to-day variability in the daily range of Sq and this has a worldwide rather than a local cause. No conclusive evidence exists for motion of the Sq foci. In low and middle latitudes the Sq variation is essentially a daytime phenomenon. 
ER  -

