Speaker
Description
JUICE was launched in April 2023, and it is now in its cruise phase to Jupiter, where it will arrive in July 2031. JUICE carries a RADiation hard Electron Monitor (RADEM) to measure protons, electrons, and ions, detecting particles coming from the anti-Sun direction. On 2024 May 13, a large solar energetic particle (SEP) event took place in association with an eruption close to the western limb of the Sun as seen from Earth. Providentially, at that time JUICE was very close located to STEREO-A.
We analysed the interplanetary context through which the particles propagated. We studied the proton anisotropies measured by near-Earth and STEREO-A and consider the isotropic period at the decay phase of the SEP event to compute the proton accumulated spectrum. We considered STEREO-A spectral fitting as the particle environment measured by JUICE and estimated the differences in the proton flux measured by JUICE in comparison with the fitting. The proton spectral indices measured by JUICE and STEREO-A were found to be similar. The proton fluxes measured by RADEM agree with those from STEREO-A, with a deviation of less than 25%.
The main conclusion of this study is that the RADEM instrument aboard JUICE represents a valuable asset for measuring SEP events throughout the heliosphere. It offers an excellent opportunity to study and characterize the energetic particle environment in the solar wind across a wide range of heliocentric distances, from 0.65 to 5.2 AU, including potential SEP measurements near Mars orbit and beyond.
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