scholarly journals INTERPLANETARY PROPAGATION OF SOLAR ENERGETIC PARTICLE HEAVY IONS OBSERVED AT 1 AU AND THE ROLE OF ENERGY SCALING

2012 ◽  
Vol 761 (2) ◽  
pp. 104 ◽  
Author(s):  
G. M. Mason ◽  
G. Li ◽  
C. M. S. Cohen ◽  
M. I. Desai ◽  
D. K. Haggerty ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Energy Scaling ◽  
Interplanetary Propagation

Role of latitude of source region in Solar Energetic Particle events

2010 ◽  
Author(s):  
S. Dalla ◽  
N. Agueda ◽  
M. Maksimovic ◽  
K. Issautier ◽  
N. Meyer-Vernet ◽  
...  
Keyword(s):  
Energetic Particle ◽  
Source Region ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events

3He rich periods measured by the Suprathermal Ion Telescope (SIT) on STEREO-A during solar cycle 24

2021 ◽  
Author(s):  
Marlon Köberle ◽  
Radoslav Bucik ◽  
Nina Dresing ◽  
Bernd Heber ◽  
Andreas Klassen ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Heavy Ions ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Detection Algorithm ◽  
Solar Cycle 24 ◽  
Time Periods ◽  
Cycle 24 ◽  
Automatic Detection Algorithm

<p><sup>3</sup>He-rich solar energetic particle (SEP) events are characterized by a peculiar elemental composition with rare species like <sup>3</sup>He or ultra-heavy ions tremendously enhanced over the solar system abundances.<br>We report on <sup>3</sup>He rich SEP periods measured by the Suprathermal Ion Telescope (SIT) onboard STEREO-A beginning in 2007 until 2020, covering the whole solar cycle 24.<br>The mass resolution capabilities of SIT do not allow to easily distinguish between <sup>3</sup>He and <sup>4</sup>He especially in cases of a low <sup>3</sup>He to <sup>4</sup>He ratio.<br>We therefore developed a semi-automatic detection algorithm to find time periods during which a <sup>3</sup>He enhancement can be statistically determined.<br>Using this method we found 112 <sup>3</sup>He rich periods.<br>These periods were further examined in regards of their <sup>3</sup>He/<sup>4</sup>He and Fe/O ratio. <br>Previously about ten <sup>3</sup>He-rich SEP periods measured by SIT on STEREO-A have been reported.<br>An association with in-situ electron measurements by STEREO-SEPT and STEREO-STE showed that ~60% of the 112 periods are accompanied with electron events.<br>The here presented catalogue of <sup>3</sup>He rich periods is intended to serve as a reference for the community.</p>

Particle-in-cell Simulation of 3He Enrichment in Solar Energetic Particle Events

2021 ◽  
Vol 922 (1) ◽  
pp. 50
Author(s):  
T. M. Li ◽  
C. Li ◽  
W. J. Ding ◽  
P. F. Chen
Keyword(s):  
Heavy Ions ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Particle In Cell ◽  
Selective Heating ◽  
Solar Energetic Particle Events ◽  
Acceleration Rate ◽  
Resonant Modes ◽  
Cell Simulation ◽  
Particle Resonance

Abstract 3He enrichment is one distinctive feature of impulsive solar energetic particle events. This study is designed to investigate the process of plasma wave–particle resonance, which plays a key role in selectively accelerating heavy ions. We apply a 1.5 dimensional particle-in-cell simulation to model the electron-beam–plasma interaction that generates electron and ion cyclotron waves, namely proton and 4He cyclotron waves, whose dispersions are dependent on the magnetization parameter α = ω pe/Ωce and the temperature ratio τ = T e /T p . The background particles, e.g., 3He and 4He, resonate with the excited cyclotron waves and experience selective heating or acceleration. Specifically, the resonant modes of 3He ions lead to a more effective acceleration rate compared to those of the 4He ions. The simulation results provide a potential solution for understanding the abundance of heavy ions in the solar wind.

scholarly journals Researchers discuss role of flares and shocks in solar energetic particle events

Eos ◽  
2002 ◽  
Vol 83 (12) ◽  
pp. 132 ◽  
Author(s):  
Ed Cliver ◽  
Berndt Klecker ◽  
May-Britt Kallenrode ◽  
Hilary Cane
Keyword(s):  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events

scholarly journals Role of flares and shocks in determining solar energetic particle abundances

2006 ◽  
Vol 111 (A6) ◽  
Author(s):  
H. V. Cane ◽  
R. A. Mewaldt ◽  
C. M. S. Cohen ◽  
T. T. von Rosenvinge
Keyword(s):  
Energetic Particle ◽  
Solar Energetic Particle
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