3He-rich solar energetic particles: Solar sources
arXiv:2002.09442 · doi:10.1007/s11214-020-00650-5
Abstract
3He-rich solar energetic particles (SEPs), showing up to a 10,000-fold abundance enhancement of rare elements like 3He or ultra-heavy nuclei, have been a puzzle for more than 50 years. One reason for the current lack of understanding of 3He-rich SEPs is the difficulty resolving the source regions of these commonly occurring events. Since their discovery, there has been strong evidence that 3He-rich SEP production is associated with flares on the Sun. Anomalous abundances of 3He-rich SEPs have been attributed to a unique acceleration mechanism that must routinely operate at flare sites. Flares associated with 3He-rich SEPs have been often observed in jet-like forms indicating an acceleration in magnetic reconnection involving field lines open to interplanetary space. Owing to a fleet of spacecraft around the Sun, providing a greatly improved resolution of solar imaging observations, 3He-rich SEP sources are now explored in unprecedented detail. This paper outlines the current understanding of 3He-rich SEPs, mainly focusing on their solar sources.
accepted for publication in Space Sci Rev
References in corpus (12)
- Small-scale filament eruptions as the driver of solar coronal hole X-ray jets
- Abundance Enhancements in Impulsive Solar Energetic-Particle Events with Associated Coronal Mass Ejections
- Multi-Spacecraft Observations of Recurrent 3He-Rich Solar Energetic Particles
- 3He-Rich Solar Energetic Particles in Helical Jets on the Sun
- Helical Blowout Jets in the Sun: Untwisting and Propagation of Waves
- Variations in Abundance Enhancements in Impulsive Solar Energetic-Particle Events and Related CMEs and Flares
- 3He-Rich Solar Energetic Particles from Sunspot Jets
- Hydrogen and the Abundances of Elements in Impulsive Solar Energetic-Particle Events
- Association of 3He-Rich Solar Energetic Particles with Large-Scale Coronal Waves
- Preferential Heating and Acceleration of Heavy Ions in Impulsive Solar Flares
- Excess H, Suppressed He, and the Abundances of Elements in Solar Energetic Particles
- Energy spectra of 3He-rich solar energetic particles associated with coronal waves
Cited by in corpus (6)
- Sixty Years of Element Abundance Measurements in Solar Energetic Particles
- Linking the Sun to the Heliosphere Using Composition Data and Modelling. A Test Case with a Coronal Jet
- Temperature in Solar Sources of 3He-rich Solar Energetic Particles and Relation to Ion Abundances
- Distinguishing the Rigidity Dependences of Acceleration and Transport in Solar Energetic Particles
- Fifty Years of 3He-rich Events
- A Perspective on Solar Energetic Particles