Velocity Distributions and Proton Beam Production in the Solar Wind

2010 ◽  
Author(s):  
Viviane Pierrard ◽  
Yuriy Voitenko ◽  
M. Maksimovic ◽  
K. Issautier ◽  
N. Meyer-Vernet ◽  
...  
Keyword(s):  
Solar Wind ◽  
Proton Beam ◽  
Beam Production

Proton Beam Abundance Variations and Their Relation to Alpha Particle Properties

2021 ◽  
Vol 923 (2) ◽  
pp. 170
Author(s):  
Tereza Ďurovcová ◽  
Jana Šafránková ◽  
Zdeněk Němeček
Keyword(s):  
Solar Wind ◽  
Proton Beam ◽  
Alpha Particle ◽  
Source Region ◽  
Radial Distance ◽  
Alpha Particles ◽  
Momentum Balance ◽  
Particle Interactions ◽  
Coulomb Collisions ◽  
Particle Properties

Abstract Less abundant but still dynamically important solar wind components are the proton beam and alpha particles, which usually contribute similarly to the total ion momentum. The main characteristics of alpha particles are determined by the solar wind source region, but the origin of the proton beam and its properties are still not fully explained. We use the plasma data measured in situ on the path from 0.3 to 1 au (Helios 1 and 2) and focus on the proton beam development with an increasing radial distance as well as on the connection between the proton beam and alpha particle properties. We found that the proton beam relative abundance increases with increasing distance from the Sun in the collisionally young streams. Among the mechanisms suggested for beam creation, we have identified the wave–particle interactions with obliquely propagating Alfvén modes being consistent with observations. As the solar wind streams get collisionally older, the proton beam decay gradually dominates and the beam abundance is reduced. In search for responsible mechanisms, we found that the content of alpha particles is correlated with the proton beam abundance, and this effect is more pronounced in the fast solar wind streams during the solar maximum. We suggest that Coulomb collisions are the main agent leading to merging of the proton beam and core. We are also showing that the variations of the proton beam abundance are correlated with a decrease of the alpha particle velocity in order to maintain the total momentum balance in the solar wind frame.

Proton Beam Production of Curie Scale Ac-225 at 100 MeV and Below

2019 ◽  
Vol 50 (1) ◽  
pp. S13
Author(s):  
Meiring Nortier Nortier ◽  
Rishi Bhandia ◽  
Eva Birnbaum ◽  
Jason Cooley ◽  
Kevin John ◽  
...  
Keyword(s):  
Proton Beam ◽  
Beam Production

scholarly journals Proton beam production by a laser ion source with hydride target

2016 ◽  
Vol 87 (2) ◽  
pp. 02A906 ◽  
Author(s):  
M. Okamura ◽  
C. Stifler ◽  
K. Palm ◽  
D. Steski ◽  
S. Ikeda ◽  
...  
Keyword(s):  
Proton Beam ◽  
Ion Source ◽  
Laser Ion Source ◽  
Beam Production

Proton Beam Production of Curie Scale Ac-225 at 100 MeV and Below

2019 ◽  
Vol 50 (4) ◽  
pp. S80
Author(s):  
Meiring Nortier Nortier ◽  
Rishi Bhandia ◽  
Eva Birnbaum ◽  
Jason Cooley ◽  
Kevin John ◽  
...  
Keyword(s):  
Proton Beam ◽  
Beam Production
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