Реферат: Mars is an ambitious target for future human exploration. The radiation environment during the transit and in Mars vicinity can be very hazardous for future human missions to the planet. In the interplanetary space and at Mars orbit the radiation field consists of two types of primary particles: galactic cosmic rays (GCR) and solar energetic particles (SEPs). The dosimetric telescope Liulin-MO for measuring the ionizing radiation environment onboard the ExoMars Trace Gas Orbiter (TGO) is a module of the Fine Resolution Epithermal Neutron Detector (FREND) [1, 2]. Liulin-MO data about the radiation environment during TGO cruise to Mars and in high elliptic Mars orbits were taken in the period from April 2016 to March 2017. Since May 2018 Liulin-MO investigates the radiation conditions at Mars science orbit, which is a circular orbit with 400 km altitude. Liulin-MO measurements to date cover the decreasing and minimum phases of the solar activity in solar cycle 24 and the rising phase, maximum, and decreasing phase near the maximum of cycle 25. In this paper we present and discuss the results for the charged particle fluxes and dose rates at 1.5 a. u. during different phases of the solar activity cycle. The results are based on measurements by Liulin-MO dosimeter on TGO in the period April 2016 – July 2025. Discussed is the selection of the best time interval in the solar cycle for a future manned trip to Mars, regarding the radiation safety. The obtained results may be used for verification and benchmarking of the galactic and REFERENCES: [1] Mitrofanov I., Malakhov A., Bakhtin B. et al. Fine Resolution Epithermal Neutron Detector (FREND) onboard the ExoMars Trace Gas Orbiter // Space Science Reviews. 2018. V. 214. Article 86. https://doi.org/10.1007/s11214-018-0522-5. [2] Semkova J., Koleva R., Benghin V. et al. Charged particles radiation measurements with Liulin-MO dosimeter of FREND instrument aboard ExoMars Trace Gas Orbiter during the transit and in high elliptic Mars orbit // Icarus. 2018. V. 303. P. 53–66. https://doi.org/10.1016/j.icarus.2017.12.034.

Библиографическая ссылка: Semkova J. , Koleva R. , Benghin V. , Krastev K. , Matviichuk Y. , Tomov B. , Bankov N. , Maltchev S. , Dachev T. , Mitrofanov I. , Golovin D. , Mokrousov M. , Litvak M. , Lukyanov N. , Shurshakov V. , Drobyshev S.
Dose rate and particle flux of cosmic rays in the free space at 1.5 AU during different phases of solar activity according measurements by Liulin-MO dosimeter on Trace Gas Orbiter
16th Moscow Solar System Symposium (16M-S3) 20-24 Oct 2025