Measurement of Quiet-Time Electric Field in the Lower Ionosphere by the Antarctic Sounding Rocket S-210JA-29 (b. Electric Fields and Current System) (Proceeding of the Second Symposium on Coordinated Observations of the Ionosphere and Magnetosphere in the Polar Regions : Part I)

Abstract

Quiet-time DC and AC (18-220 Hz) electric fields were observed in the lower ionosphere up to 118 km by means of spherical double probes on board the sounding rocket S-210JA-29 which was launched from Syowa Station at 16.15 UT on July 12, 1977 The DC electric field intensity was～10 mV/m in the lower E region where the electron density was 2-3×10^4 cm^, while it increased sharply up to ～130 mV/m above the altitude of ～110 km with a good correlation with the decrease in the electron density. 0nly weak AC noise was observed in the whole altitude range