Remote Energetic Neutral Atom Imaging of Electric Potential Over a Lunar Magnetic Anomaly

TL;DR

This paper introduces a remote imaging technique using hydrogen neutral atoms to map electric potential over lunar magnetic regions, confirmed by data showing potentials exceeding +135 V, impacting local lunar environment understanding.

Contribution

The study presents a novel remote imaging method for lunar electric potential mapping using hydrogen neutral atoms, validated with Chandrayaan-1 data.

Findings

Confirmed electric potential > +135 V over Gerasimovic anomaly

Electric potential spreads across the magnetized region

Potential influences local plasma and dust environment

Abstract

The formation of electric potential over lunar magnetized regions is essential for understanding fundamental lunar science, for understanding the lunar environment, and for planning human exploration on the Moon. A large positive electric potential was predicted and detected from single point measurements. Here, we demonstrate a remote imaging technique of electric potential mapping at the lunar surface, making use of a new concept involving hydrogen neutral atoms derived from solar wind. We apply the technique to a lunar magnetized region using an existing dataset of the neutral atom energy spectrometer SARA/CENA on Chandrayaan-1. Electrostatic potential larger than +135 V inside the Gerasimovic anomaly is confirmed. This structure is found spreading all over the magnetized region. The widely spread electric potential can influence the local plasma and dust environment near the magnetic anomaly.