Spectral Properties and Heavy Ion Abundances of Energetic Particles in SEP and CIR events observed during the first two Parker Solar Probe Orbits
Abstract
NASA's Parker Solar Probe (PSP), successfully launched on August 12 2018, has completed its first two orbits around our Sun. With perihelia ~35 Rs for both encounters, PSP has made the closest-ever observations of the solar wind plasma, electromagnetic fields, and energetic particle environment in the inner heliosphere. The Energetic Particle Instruments (EPI) of the Integrated Science Investigation of the Sun (ISOIS) suite observed a number of solar energetic particle (SEP) events associated with flaring regions on the Sun, coronal mass ejections-driven shocks, and local compression regions, as well as particle events associated with corotating or stream interaction regions. This talk surveys the spectral properties and abundances of ~0.1-2 MeV/nucleon suprathermal H-Fe nuclei during these events and compares them with prior observations of their counterparts observed at 1 AU. We discuss these new PSP results in the context of our current understanding of the origin and acceleration of suprathermal ions, the acceleration of SEPs, and on the nature of particle transport inside Earth orbit. Finally, we discuss the implications of these results for existing theoretical models of the origin of suprathermal tails, and of the acceleration and transport of SEPs and CIR-associated energetic particle events.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSH22A..06D
- Keywords:
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- 7514 Energetic particles;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY;
- 7519 Flares;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY;
- 7845 Particle acceleration;
- SPACE PLASMA PHYSICS;
- 7859 Transport processes;
- SPACE PLASMA PHYSICS