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The Mars Ion and Neutral Particle Analyzer (MINPA), one of the sevenscientific payloads onboard the Tianwen-1 orbiter, was designed to measure ions and energetic neutral atoms (ENAs) at Mars. Here, we present MINPA's first results of the solar-wind ENAs, which are produced through the charge exchange process between the solar wind hydrogen ions and the neutral atoms of theMartian exosphere. We perform a comprehensive comparison between the inflight ENA data and ground calibration results to understand the energy and angular distributions of the solar-wind ENA signalsby MINPA, and an algorithm is developed to convert the ENA count rate to intensity. The contamination by solar extreme ultraviolet (EUV) and the observation independency between ENAs and ions are both evaluated. We will present several cases and statistic results of the solar wind ENA observations, and their intensities are estimated to be 10⁵~10⁶ cm^-2 sr^-1 s^-1, which is in good agreement with previousmodel attempts.
Ma et al. (Fri,) studied this question.