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 by Nancy Jones for GSFC News Greenbelt MD (SPX) May 20, 2022
On February 22, 2022, NASA's MAVEN spacecraft went into safe mode when the spacecraft's Inertial Measurement Units (IMUs) began exhibiting anomalous behavior. The spacecraft is currently out of safe mode, stable and in Earth-nadir mode, pointing its high gain antenna toward Earth to facilitate high-rate communications. In this configuration, however, MAVEN cannot perform communications relays for other spacecraft on Mars and is performing only limited science observations. The mission team began science instrument recovery on April 20. Safe mode began when the IMUs, navigation instruments that sense the spacecraft's rotation and control the pointing of the orbiter's antenna and science instruments, exhibited anomalies when turning on after a power cycle. MAVEN stayed in safe mode until April 19 when the mission team switched the spacecraft to rely on stellar navigation instead of the IMUs, which is known as "all stellar" mode. All MAVEN's science instruments are currently online, but not all of them have been able to take data while the high gain antenna is restricted to pointing toward Earth. The team is currently working to finish checkouts of "all stellar" mode to enable the spacecraft to operate in other orientations prior to resuming nominal science and relay operations by the end of the month.
Physicists explain how type of aurora on Mars is formed Iowa City IA (SPX) May 19, 2022 Physicists led by the University of Iowa have learned how a type of aurora on Mars is formed. In a new study, the physicists studied discrete aurora, a light-in-the-sky display that occurs mostly during the night in the red planet's southern hemisphere. While scientists have known about discrete aurora on Mars-which also occur on Earth-they did not know how they formed. That's because Mars does not have a global magnetic field like Earth, which is a main trigger for aurora, also called the northern and ... read more
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