A VBz parameter study of the CME propagation with EUHFORIA: a perspective from the HENON mission.

Space missions play a key role in predicting natural hazards like Coronal Mass Ejections (CMEs) and high fluxes of solar energetic particles that hit the Earth. In this work we carry out a preparatory study for the interpretation of the data that will be collected by a new space mission under development by the Italian ASI. The name of the space mission is HEliospheric pioNeer for solar and interplanetary threats defeNce (HENON) and its aim is to improve the forecasting capabilities of the Space Weather hazards such as SEPs/CMEs events and geoffective interplanetary disturbances. We use the 3D-MHD numerical code EUHFORIA. We insert the possible trajectories of the Henon spacecraft in EUHFORIA and we simulate the evolution of CMEs varying the initial parameters of the code. We determine from the simulation the VB_z parameter that allow us to understand if a specific event can be dangerous for the environemnt around the Earth or not. Here, V is the solar wind speed, B_z is the southward component of the interplanetary magnetic field, and VB_z is the motional electric field which couples with the Earth's magnetosphere and pumps energy into it. In order to have a comparison with real data, we study the event of 03/11/2021 seen by ACE and SolO. ACE and SolO were at the same position in latitude and longitude in this date, with a radial separation of about 22 million km. We make a comparison between numerical simulation and results at ACE and SolO. In this way we make a forecasting analysis in order to understand what are the events potentially dangerous for space weather. On going simulations will be used to benchmark the forecasting capabilities of EUHFORIA, too.