FY-4B HEPDFY-4B/HEPD High-Energy Electron Observations at GEO (0.4–4 MeV, Nine Directions)

Background & Use: Continuous GEO monitoring with three detector units (−Z, +X/+Y 30°, −X/−Y 30°) providing nine look directions and ~180° FOV. Supports radiation belt studies, space-weather operations, and satellite engineering. The 11 May 2024 storm response (drop–recovery–enhancement) is clearly captured and consistent with GOES-16, demonstrating stable performance.Generation & Processing: Silicon telescope stacks, digital pulse-height analysis; 8 energy channels (0.4–4 MeV).HEPD File meaning: In-orbit electron measurements by FY-4B/HEPD with millisecond timestamps and 8 energy channels.Time: UTC with milliseconds, (e.g., 2024-05-11T12:00:00.123Z).Channels (MeV): E1 0.4–0.5, E2 0.5–0.6, E3 0.6–0.8, E4 0.8–1.0, E5 1.0–1.2, E6 1.2–1.5, E7 1.5–2.0, E8 2.0–4.0pa File meaning: Time series of pitch angle.Time: UTC with seconds, (e.g., 2024-05-11T12:00:00Z).Columns: time, pa (degree, 0–180°).