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Abstract
The induced magnetosphere boundary (IMB) forms between the Martian magnetosheath and the induced magnetosphere/ionosphere and is important in energy and momentum transport and particle escape at Mars. Based on MAVEN multi-instrument observations in the year 2015, we find the IMBs usually appear with distinct variations of magnetic field and plasma, though they could be disturbed occasionally, especially at large solar zenith angles (SZAs). This study focuses on the properties of the distinct IMBs. The magnetic field strength is enhanced and the magnetic fluctuations are suppressed in IMB. The solar wind particles decrease and the planetary heavy ions start to be dominant in IMB. The variation of plasma is more effective in identifying the IMB's location since it is consistent at all SZAs, while the enhancement of the magnetic field strength or the suppression of the magnetic fluctuations would become ambiguous at large SZAs. The currents in IMB exhibit the signature of field-aligned-like and have larger magnitudes at the subsolar region. The kinetic effect of multiple ion species could be important near IMB. The properties of the Martian IMB investigated here are helpful in identifying this region and understanding the Mars-solar wind interaction and the Martian ionosphere/atm evolution.
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