A groundbreaking international study led by Prof. JIAN Zhang from the University of Science and Technology of China (USTC) has reconstructed Mars' solar energetic particle (SEP) spectrum for the first time. Focused on the February 15, 2022, SEP event, this research offers critical insights into the radiation environment on the Red Planet. The findings were recently published in *Geophysical Research Letters*.
Mars, with its thin atmosphere and lack of a global magnetic field, is vulnerable to intense space radiation, which presents significant challenges to human exploration and spacecraft durability. Understanding the Martian radiation environment during major SEP events is essential for ensuring the safety of future missions.
The research team concentrated on analyzing the 2022 SEP event, a highly energetic occurrence that underscored the extreme radiation risks posed by Mars' environment. Using data from a diverse array of detectors, including China's Tianwen-1 Mars Energetic Particle Analyzer (MEPA), the European Space Agency's Trace Gas Orbiter, NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft, and the Curiosity rover, the team reconstructed the SEP event's energy spectrum, covering protons with energies up to 1 GeV.
This detailed reconstruction provided critical data for modeling the radiation doses encountered in Mars' orbit and on its surface. These dose models are vital for assessing the impact of radiation on human health and the integrity of spacecraft electronics.
To refine their results, the researchers accounted for shielding effects caused by both Mars' thin atmosphere and spacecraft structures. Advanced modeling techniques were employed to estimate radiation exposure accurately, with results validated against direct dosimetry data from the detectors.
This study represents a significant advancement in our understanding of Mars' radiation environment, offering a foundation for the development of protective measures for future missions. It also marks the first comprehensive synergy of data collected from multiple instruments on Mars and in orbit.
