2:45 PM - 3:00 PM
[PCG31-12] Measurement of ionosphere by microsatellite "GAIA-I" and development of the electron density and temperature probe: EDTP
EDTP has a probe that is formed by two semicircular plate shapes. When a sinusoidal voltage whose frequency is lower than ion plasma frequency is applied to an electrode, the floating potential shifts to the negative potential. The electron temperature can be calculated from the ratio of the two floating potential shifts which are caused by applying two successive signal of amplitude a and 2a. This principle to measure electron temperature is applied the instrument was developed in 1970, which is named Electron Temperature Probe (ETP).
In a high frequency region, plasma impedance is more dominant and the amplitude of sinusoidal signal which is applied between electrode and sheath edge is controlled by the combination of sheath impedance and plasma impedance. Based on this principle, we added one more function of ETP to measure electron density as well by replacing low frequency oscillator which was used for ETP to sweep frequency generator.
We tested ETDP experiment that compared ETDP with Langmuir Probe and Impedance Probe by using space chamber. Our experiment has revealed that EDTP is better than conventional ionosphere measurement.