Best L1

A NASA spacecraft launched in 1994 and stationed near the L1 Lagrange point to study solar wind properties and their interaction with Earth's magnetosphere.

NOAA/NASA spacecraft stationed at the Sun-Earth L1 Lagrange point since 2015, monitoring solar wind and capturing full-disk Earth images with its EPIC camera.

ACE is NASA's 1997 Advanced Composition Explorer at Sun-Earth L1, notable for long-running solar wind and energetic particle monitoring.

Aditya-L1 is ISRO's first solar observatory, launched in 2023 and placed in a halo orbit around Sun-Earth L1 in January 2024.