MULTIPLE CORRELATION BETWEEN AURORAL AND MAGNETIC PULSATIONS .2. DETERMINATION OF ELECTRIC CURRENTS AND ELECTRIC-FIELDS AROUND A PULSATING AURORAL PATCH

The multiple correlation method has been applied to the study of concurrent auroral and magnetic pulsations on the basis of videotapes of all-sky television camera auroral records and inducation magnetometer records. The results show that: the ground magnetic pulsations below pulsating auroras are well represented by a regression model where the magnetic change is expressed as a linear combination of auroral luminosity fluctuations at various parts of the sky; the magnetic variation observed at a single station can be broken down into the magnetic contributions from various auroral patches; the magnetic deflections at various ground points below a pulsating auroral form can be estimated even when many pulsating patches appear at the same time; and the horizontal magnetic deflections deduced from observations by use of this technique are fully explained by the combination of ionospheric and field-aligned electric currents which are theoretically expected to be induced in and near a local enhancement of conductivity under the existence of a uniform, ambient electric field.