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03 april 2026, 14:57 мск

The entire Artemis 2 mission is currently taking place under conditions of increased radiation load.

Proton flux in near-Earth space. The red graph represents particles with energies above 10 MeV.
Proton flux in near-Earth space. The red graph represents particles with energies above 10 MeV.

The number of heavy particles (protons with energies above 10 MeV) in near-Earth space is currently approximately tenfold higher. The increase in particle density is a response to the general increase in solar activity that began in late March and was recorded almost simultaneously with the launch of the space mission. However, it could not have affected the spacecraft's main maneuvers. All of them, including yesterday's most critical maneuver to place the spacecraft into orbit toward the Moon, were performed at low altitudes, which are maximally shielded by the Earth's magnetic field and, partially, the atmosphere.

Particle fluxes have not yet reached the radiation storm threshold and are at 50-60% of the limit above which a warning is issued for spacecraft. NASA also, as far as can be understood, does not consider it necessary to require the crew to take protective measures (donning special vests and moving to a radiation shelter). The spacecraft's electronics have triple modular redundancy. An interesting fact is that the spacecraft's "brains" are the time-tested PowerPC 750FX processors (similar to those found in older iBooks), as their architecture is much more stable in space than that of modern ultra-small chips.

Yesterday's M-level flare, according to general consensus, should not lead to an additional increase in radiation exposure.

NASA and NOAA continue to monitor the radiation situation. The radiation dose accumulated by the crew is tracked by special sensors.

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Laboratory of Solar Astronomy,SRI RAS

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