HERMES is and instrument package that will be placed upon the Gateway, an orbital outpost which will support Artemis lunar operations while demonstrating the technologies necessary to conduct a historic human mission to Mars. HERMES will concentrate on understanding the causes of space-weather variability as driven by the Sun and modulated by the magnetosphere. As we move deeper into space, human and robotic explorers face greater challenges from the sometimes violent and unpredictable outbursts of the Sun. The space weather instrument suite will gather data and enhance our ability to forecast events originating from the Sun that could affect our astronauts on and around the Moon as well as on future missions to Mars.
The NASA space weather instrument suite, led by the Heliophysics Division, will observe solar particles and the solar wind. The second scientific investigation is a radiation instrument package, built by the European Space Agency.