Physics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85..633c&link_type=abstract
Journal of Geophysical Research, vol. 85, Feb. 1, 1980, p. 633-643.
Physics
5
Diurnal Variations, Ionospheric Currents, Magnetic Effects, Magnetic Variations, Magnetospheric Instability, Midlatitude Atmosphere, Ring Currents, Geomagnetism, Magnetic Disturbances, Spatial Distribution, Vertical Distribution
Scientific paper
At midlatitudes the presence of Sq variation is a problem, as variability of Sq currents may produce magnetic perturbations comparable to the magnetic effects of the partial ring current on comparable time scales. The paper reports the results of an empirical determination of the quiet magnetic field, which includes the Sq variation and secular variation at 27 midlatitude magnetic observatories for the 1967-1968 period. The main concern is with the consequences of the quiet field uncertainty in terms of using midlatitude magnetic data to quantify the size and location of the magnetic disturbances caused by substorms and the ring current. Attention is given to investigating the error associated with the empirical model used. It is shown how the uncertainty can be reduced by examining the changes occurring in some interval of time.
Clauer Robert C.
Galland Kivelson Margaret
McPherron Robert L.
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