Структура и динамика полярных токовых систем : материалы международного симпозиума «Полярные геомагнитные явления», 25-31 мая, Суздаль, СССР / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т. – Апатиты : [б. и.], 1988. – 150 с.

iOmVm I— i- iOmVm- - 0 + к I \ 4 403.0-403.3 Pig. 5. Examples of received ac signals (electric field component parallel ST) versus time from four flight time intervals. DI8CUSSIOM. The electric field configuration as displayed in Fig.3 indicates a localized perturbation rather than a longitudinally extended arc. The EISCAT observations verified that the configuration is steady. The two "charge centers" south and north of the precipitation region have to be main­ tained by field-aligned current in the south and a downward current in the north. The currents resulting from the height integrated Pedersen conductivity I p ~ 10 S and div ii l would cause a magnetic field deviation at the payload trajectory of up to ~ 70 nT. The CAESAR de-magnetometer, however, measured only a maximum deviation of ~ 25 nT. Furthermore there is a surprising high electric field of 20 mVuf1 across the arc region with its high electric condu­ ctivity. Fig. 6. Sketch of electric field and current configuration derived from CAESAR and EISCAT measurements. The dash-dotted ourves represent equipotential conturo drawn to fit the electric field measurements. FLIGHT TIME INTERVALS (s) iOmVm'1 i — (— i 93