  Tianwen-1 spacecraft (Wan et al. 2020) is China's first Mars exploration
mission. The Mars Orbiter Magnetometer (MOMAG) is a scientific instrument
aboard the Tianwen-1 mission that is designed to study magnetic fields at Mars,
including the solar wind to the magnetosheath and the ionosphere. Using the
first Tianwen-1/MOMAG data that is publicly available, we present
interplanetary coronal mass ejection (ICME) and stream interaction region (SIR)
catalogues based on in-situ observations at Mars between November 16, 2021, and
December 31, 2021. We compared the magnetic field intensity and vector magnetic
field measurements from Tianwen-1/MOMAG and Mars Atmospheric Volatile EvolutioN
(MAVEN)/MAG during the ICME and SIR interval and found a generally good
consistency between them. Due to MAVEN's orbital adjustment since 2019, the
Tianwen-1/MOMAG instrument is currently the almost unique interplanetary
magnetic field monitor at Mars. The observations indicate that the MOMAG
instrument on Tianwen-1 is performing well and can provide accurate
measurements of the vector magnetic field in the near-Mars solar wind space.
The multi-point observations combining MOMAG, MINPA, and MEPA on board
Tianwen-1 with MAG, SWIA, and STATIC on board MAVEN will open a window to
systematically study the characteristic of ICMEs and SIRs at Mars, and their
influences on the Martian atmosphere and ionosphere.
