@article{oai:nipr.repo.nii.ac.jp:00001766,
 author = {Tamao, Tsutomu and Taniguchi, Haruyuki and Nambu, Mitsuhiro and Miura, Akira},
 journal = {Memoirs of National Institute of Polar Research. Special issue},
 month = {Jul},
 note = {P(論文), Attempt has been made to evaluate a direct contribution of the horizontal component of oblique field-aligned currents to surface magnetic variations in the auroral region associated with a localized electric potential distribution on the horizontal plane, in comparison with that of the ionospheric eddy current. This direct effect is proportional to a product of two ratios, the Pedersen to Hall conductivities and the horizontal to vertical components of the local dipole magnetic intensity. In addition to these, the shorter the horizontal scale-length in the east-west direction compared with that in the north-south direction, the larger the direct effect of field-aligned currents. For the localized perturbation with an isotropic horizontal structure at 60° geomagnetic latitude, it attains to about 80% of the magnetic contribution of the Hall current at the earth's surface. It is also shown that only the vertical component of oblique field-aligned currents connects with the irrotational part of ionospheric currents, and that the effective conductance in the magnetosphere for three-dimensional current systems is reduced to a smaller value than that for the case of vertical field lines.},
 pages = {273--280},
 title = {Direct contribution of oblique field-aligned currents to magnetic field variations on the ground},
 volume = {36},
 year = {1985}
}