Open AccessThe Sq current system during the International Geophysical Year
Author(s) -
Malin S. R. C.,
Gupta J. C.
Publication year - 1977
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1977.tb03720.x
Subject(s) - longitude , quiet , latitude , geophysics , midnight , current (fluid) , geodesy , harmonic , geology , geographic coordinate system , meteorology , physics , astronomy , oceanography , quantum mechanics
Summary. The daily variation for the mean of the eight most quiet days of the IGY is represented as a function of latitude, longitude and UT by means of a spherical harmonic model. The most appropriate choice of Sq baseline is investigated, on the assumption that the external electric currents deduced from the model should be negligible at local midnight. The properties of the final model are discussed, particularly with regard to the external current foci, and are compared with those of previous models.