The Long Period of 3He-rich Solar Energetic Particles Measured by Solar
Orbiter 2020 November 17--23
Abstract
We report observations of a relatively long period of 3He-rich solar
energetic particles (SEPs) measured by Solar Orbiter. The period
consists of several well-resolved ion injections. The high-resolution
STEREO-A imaging observations reveal that the injections coincide with
extreme ultraviolet jets and brightenings near the east limb, not far
from the nominal magnetic connection of Solar Orbiter. The jets
originated in two adjacent, large, and complex active regions, as
observed by the Solar Dynamics Observatory when the regions rotated into
the Earth’s view. It appears that the sustained ion injections were
related to the complex configuration of the sunspot group and the long
period of 3He-rich SEPs to the longitudinal extent covered by the group
during the analyzed time period.