[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

[PEM12-P16] DC electric field analysis during the nighttime medium-scale traveling ionospheric disturbance observed by S-520-32 sounding rocket

*Matsuyama Miyuki¹, Keigo Ishisaka¹, Yuki Ashihara², Mamoru Yamamoto³, Atsushi Kumamoto⁴, Hidetaka Shirasawa⁵, Takumi Abe⁶ (1.Toyama Prefectural University, 2.National Institute of Technology, Nara College, 3.Kyoto University/RISH, 4.Tohoku University, 5.Tokai University, 6.JAXA/ISAS)

Keywords:MSTID, Sounding Rocket, Electric Field

The Medium Scale Traveling Ionospheric Disturbance (MSTID) is a plasma density structure in the mid-latitude ionospheric F region, especially, the nighttime MSTID occur in summer. The growth principle of the nighttime MSTID is proposed the Perkins instability and electromagnetic coupling of the ionospheric E-F region. The S-520-32 sounding rocket was launched from JAXA Uchinoura Space Center at 23:20 JST on August 11, 2022 to investigate the nighttime MSTID generation mechanism. The Total Electron Content maps (TEC) observed by the GNSS satellite showed northwest-southeast structures at the time of launch.
The Electric Field Detector (EFD) on board of this rocket observed low frequency electric fields from DC to 50 Hz in situ. It has two orthogonal dipole antennas with a tip-to-tip 5.5 m and observed electric fields of two orthogonal components in the spin plane perpendicular to the rocket axis using the double probe method. The observed data showed a sinusoidal waveform of 0.95 Hz, the same as the spin frequency. This indicates that the EFD successfully observed the composite of the natural electric field and the induced electric field from the rocket motion across the magnetic field.
In this paper, we will show the analysis result of the DC electric field observed by the S-520-32 sounding rocket and reveal the relationship between the DC electric field and the plasma density structure.