EPP

地球与行星物理

ISSN  2096-3955

CN  10-1502/P

The Langmuir Probe Onboard CSES: data inversion analysis method and first results
Rui Yan, YiBing Guan, XuHui Shen, JianPing Huang, XueMin Zhang, Chao Liu, DaPeng Liu
doi: 10.26464/epp2018046
The Langmuir probe (LAP), onboard the China seismic electromagnetic satellite (CSES), has been designed for in situ measurements of bulk parameters of the ionosphere plasma, the first Chinese application of in-situ measurement technology in the field of space exploration. The two main parameters measured by LAP are electron density and temperature. In this paper, a brief description of the LAP and its work mode are provided. Based on characteristics of the LAP, and assuming an ideal plasma environment, we introduce in detail a method used to invert the I-V curve; the data products that can be accessed by users are shown. Based on the LAP data available, this paper reports that events such as earthquakes and magnetic storms are preceded and followed by obvious abnormal changes. We suggest that LAP could provide a valuable data set for studies of space weather, seismic events, and the ionospheric environment.
Keywords: Langmuir probe (LAP), Current-Voltage (I-V) curve, electron density (Ne), electron temperature (Te)
China Seismo-Electromagnetic Satellite search coil magnetometer data and initial results
Qiao Wang, JianPing Huang, XueMin Zhang, XuHui Shen, ShiGeng Yuan, Li Zeng, JinBin Cao
doi: 10.26464/epp2018044
Four levels of the data from the search coil magnetometer (SCM) onboard the China Seismo-Electromagnetic Satellite (CSES) are defined and described. The data in different levels all contain three components of the waveform and spectrum of the induced magnetic field around the orbit in the frequency range of 10 Hz to 20 kHz; these are divided into an ultra-low-frequency band (ULF, 10–200 Hz), an extremely low frequency band (ELF, 200–2200 Hz), and a very low frequency band (VLF, 1.8–20 kHz). Examples of data products for Level-2, Level-3, and Level-4 are presented. The initial results obtained in the commission test phase demonstrated that the SCM was in a normal operational status and that the data are of high enough quality to reliably capture most space weather events related to low-frequency geomagnetic disturbances.
Keywords: search coil magnetometer, CSES, data description, earthquake

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