interplanetary medium

First year of energetic particle measurements in the inner heliosphere with Solar Orbiter's Energetic Particle Detector

*Context.* Solar Orbiter strives to unveil how the Sun controls and shapes the heliosphere and fills it with energetic particle radiation. To this end, its Energetic Particle Detector (EPD) has now been in operation, providing excellent data, for …

The first widespread solar energetic particle event observed by Solar Orbiter on 2020 November 29

*Context.* On 2020 November 29, the first widespread solar energetic particle (SEP) event of solar cycle 25 was observed at four widely separated locations in the inner (≲1 AU) heliosphere. Relativistic electrons as well as protons with energies 50 …