Solar Source Regions for3He‐rich Solar Energetic Particle Events Identified Using Imaging Radio, Optical, and Energetic Particle Observations

2006 ◽  
Vol 648 (2) ◽  
pp. 1247-1255 ◽  
Author(s):  
M. Pick ◽  
G. M. Mason ◽  
Y.‐M. Wang ◽  
C. Tan ◽  
L. Wang
Keyword(s):  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Source ◽  
Source Regions ◽  
Solar Energetic Particle Events

scholarly journals Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field Line Braiding Model with Compound Injections

2022 ◽  
Vol 924 (1) ◽  
pp. 22
Author(s):  
Fan Guo ◽  
Lulu Zhao ◽  
Christina M. S. Cohen ◽  
Joe Giacalone ◽  
R. A. Leske ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energetic Particle ◽  
Radial Distance ◽  
Solar Energetic Particle ◽  
The Sun ◽  
Ion Composition ◽  
Source Regions ◽  
Solar Energetic Particle Events ◽  
Composition Ratios ◽  
Inner Heliosphere

Abstract We propose a model for interpreting highly variable ion composition ratios in solar energetic particle (SEP) events recently observed by the Parker Solar Probe (PSP) at 0.3–0.45 au. We use numerical simulations to calculate SEP propagation in a turbulent interplanetary magnetic field with a Kolmogorov power spectrum from large scales down to the gyration scale of energetic particles. We show that when the source regions of different species are offset by a distance comparable to the size of the source regions, the observed energetic particle composition He/H can be strongly variable over more than two orders of magnitude, even if the source ratio is at the nominal value. Assuming a 3He/4He source ratio of 10% in impulsive 3He-rich events and the same spatial offset of the source regions, the 3He/4He ratio at observation sites also vary considerably. The variability of the ion composition ratios depends on the radial distance, which can be tested by observations made at different radial locations. We discuss the implications of these results on the variability of ion composition of impulsive events and on further PSP and Solar Orbiter observations close to the Sun.

Source Regions of Major Solar Energetic Particle Events

2003 ◽  
Author(s):  
N. V. Nitta ◽  
E. W. Cliver ◽  
A. J. Tylka ◽  
P. Smit
Keyword(s):  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Source Regions ◽  
Solar Energetic Particle Events

scholarly journals Temperature of Source Regions of 3He-Rich Impulsive Solar Energetic Particle Events

2017 ◽  
Vol 13 (S335) ◽  
pp. 14-16 ◽  
Author(s):  
N.-H. Chen ◽  
R. Bučík ◽  
R.-S. Kim
Keyword(s):  
Energetic Particle ◽  
Emission Measure ◽  
Solar Energetic Particle ◽  
Heavy Ion ◽  
Solar Dynamics Observatory ◽  
Dissipation Process ◽  
Solar Source ◽  
Source Regions ◽  
Dem Analysis ◽  
Solar Dynamics

AbstractImpulsive solar energetic particle (SEP) events originate from the energy dissipation process in small solar flares. Anomalous abundances in impulsive SEP events provide an evidence on unique, yet unclear, acceleration mechanism. The pattern of heavy-ion enhancements indicates that the temperature of the source plasma that is accelerated is low and not flare-like. We examine the solar source of the 3He-rich SEP event of 2012 November 20 using Solar Dynamics Observatory (SDO)/ Atmospheric Imaging Assembly (AIA) images and investigate its thermal variation. The examined event is associated with recurrent coronal jets. The Differential Emission Measure (DEM) analysis is applied to study the temperature evolution/distribution of the source regions. Preliminary results show that the temperature of the associated solar source is ranged between 1.2-3.1 MK.

scholarly journals Proton intensity spectra during the solar energetic particle events of May 17, 2012 and January 6, 2014

2015 ◽  
Vol 576 ◽  
pp. A120 ◽  
Author(s):  
P. Kühl ◽  
S. Banjac ◽  
N. Dresing ◽  
R. Goméz-Herrero ◽  
B. Heber ◽  
...  
Keyword(s):  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events ◽  
Proton Intensity
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