Geology

Meteorology

Operating system

Inversion (geology)

Langmuir probe

Computer science

Mode (computer interface)

Plasma

Astronomy

Quantum mechanics

Tectonics

Satellite

Seismology

Plasma diagnostics

Remote sensing

Computational physics

Geophysics

Ionosphere

Physics

Earth and Planetary Physics

The Langmuir Probe (LAP), onboard the China Seismo-Electromagnetic Satellite (CSES), has been designed for <italic>in situ</italic> measurements of bulk parameters of the ionosphere plasma, the first Chinese application of <italic>in-situ</italic> 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.

The Langmuir Probe Onboard CSES: data inversion analysis method and first results