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Mars Orbiter MAGnetometer (MOMAG) is a scientifc instrument onboard theorbiter of China's first mission for Mars -- Tianwen-1. It started to routinelymeasure the magnetic field from the solar wind to magnetic pile-up regionsurrounding Mars since November 13, 2021. Here we present its in-flightperformance and first science results based on the first one and a half months'data. By comparing with the magnetic field data in the solar wind from the MarsAtmosphere and Volatile EvolutioN (MAVEN), the magnetic field by MOMAG is atthe same level in magnitude, and the same magnetic structures with the similarvariations in three components could be found in MOMAG data. In the first oneand a half months, we recognize 158 clear bow shock (BS) crossings from MOMAGdata, whose locations statistically match well with the modeled average BS. Wealso identify 5 pairs of simultaneous BS crossings of the Tianwen-1's orbiterand MAVEN. These BS crossings confirm the global shape of modeled BS as well asthe south-north asymmetry of the Martian BS. Two presented cases in this papersuggest that the BS is probably more dynamic at flank than near the nose. Sofar, MOMAG performs well, and provides accurate magnetic field vectors. MOMAGis continuously scanning the magnetic field surrounding Mars. Thesemeasurements complemented by observations from MAVEN will undoubtedly advanceour understanding of the plasma environment of Mars.

The Mars Orbiter Magnetometer of Tianwen-1: In-flight Performance and First Science Results