Whitepaper #431 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space-based missions/projects; user-need-driven basic space weather research.
The SunCHASER (L4) mission concept follows high-energy processes around the west limb, combining solar remote sensing & in situ, overseeing the solar radiation hemisphere. It is essential for solar particle event and all-clear forecasting. SunCHASER+ includes L5, providing 240° longitude coverage of photospheric B field, active region magnetic field diagnostics, and continuous view of both poles.