Despite the significant progresses achieved in recent years, the physical mechanisms underlying the origin of Solar Energetic Particles (SEPs) are still matter of debate. The complex nature of both particle acceleration and transport poses challenges to developing a universal picture of SEP events that encompasses both the low energy ($>$ tens of keV) observations made by space-based...
Fermi/LAT observations of Long Duration Gamma-Ray Flares (LDGRFs,) first identified with Compton Gamma-Ray Observatory (CGRO) and the Solar Maximum Mission (SMM), have transformed our picture of these unusually energetic phenomena at the Sun from a once rare occurrence to detections of dozens over the last solar cycle. The extreme energies and long temporal durations of many of these events...
NASA’s fleet of geospace and interplanetary spacecraft have collectively provided long-term monitoring of solar, heliospheric, and galactic energetic particles from the inner solar system to the outer heliosphere and now with Voyager 1 in local interstellar space. The new proton and helium flux data from AMS-02 will extend Heliophysics System Observatory (HSO) data coverage in the NASA archive...
