Positive on the day side, negative on the night side. https://ntrs.nasa.gov/api/citations/20220007230/downloads/FinalManuscript-Electrostatic%20charging%20of%2

Positive on the day side, negative on the night side. https://ntrs.nasa.gov/api/citations/20220007230/downloads/FinalManuscript-Electrostatic%20charging%20of%20the%20lunar%20surface-ICES%202022.pdf https://ntrs.nasa.gov/api/citations/20220007230/downloads/Fi...