Sun: corona

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 unusual widespread solar energetic particle event on 2013 August 19. Solar origin and particle longitudinal distribution

*Context.* Late on 2013 August 19, STEREO-A, STEREO-B, MESSENGER, Mars Odyssey, and the L1 spacecraft, spanning a longitudinal range of 222° in the ecliptic plane, observed an energetic particle flux increase. The widespread solar energetic particle …