Preliminary report of DC electric field measurements in the ionosphere by Kagoshima sounding rocket experiments

S-310-37 and S-520-23 sounding rocket experiments are carried out at Uchinoura Space Center (USC) in 2007. The purpose of S-310-37 rocket experiment is an integrated observation of the high electron temperature layer in the Sq current focus during the winter daytime over USC. In order to measure the field-aligned electric field due to the Sq current, we develop the three-dimensional electric field detector (EFD). The EFD measures three components of electric field by using 3 pair of probe antenna. S-310-37 sounding rocket was launched at 11:20 LT on January 16, 2007. The apex of rocket trajectory was about 138 km. As a result of rocket measurement, it is clearly seen three components of electric field are fluctuated at the altitude from about 90 km to 120 km during the ascent. Particularly the electric field component parallel to the rocket spin axis is fluctuated in the region where the electron temperature is high. The purpose of S-520-23 rocket experiment is the investigation of the process of momentum transportation between the atmospheres and the plasma in the thermosphere during the summer evening time at mid latitudes. The electric filed and VLF/MF band receiver (EVMR) is loaded on this sounding rocket. The EVMR measures the two components of electric field by using 2 pair of probe antenna in order to obtain a dynamics of plasma particle in the ionosphere. S-520-23 sounding rocket was launched at 19:20 LT on September 2, 2007. The apex was about 279 km. The DC electric field was measured by the EVMR onboard S-520-23 sounding rocket. In this presentation, we report on the result of DC electric field measurement of two sounding rockets. In particular we will discuss about the relation between DC electric field and high electron temperature layer in the ionosphere using the results of S-310-37 sounding rocket experiments. Then we will show the preliminary report of DC electric field in the ionospheric E and F region measured by S-520-23 sounding rocket experiments.