Alfvén waves, alpha particles, and pickup ions in the solar wind

1996 ◽  
Author(s):  
B. E. Goldstein ◽  
M. Neugebauer ◽  
E. J. Smith
Keyword(s):  
Solar Wind ◽  
Alpha Particles ◽  
Pickup Ions

Alfvén waves, alpha particles, and pickup ions in the solar wind

1995 ◽  
Vol 22 (23) ◽  
pp. 3389-3392 ◽  
Author(s):  
B. E. Goldstein ◽  
M. Neugebauer ◽  
E. J. Smith
Keyword(s):  
Solar Wind ◽  
Alfven Waves ◽  
Alpha Particles ◽  
Alfvén Waves ◽  
Pickup Ions

Acceleration of interstellar pickup ions in the disturbed solar wind observed on Ulysses

1994 ◽  
Vol 99 (A9) ◽  
pp. 17637 ◽  
Author(s):  
G. Gloeckler ◽  
J. Geiss ◽  
E. C. Roelof ◽  
L. A. Fisk ◽  
F. M. Ipavich ◽  
...  
Keyword(s):  
Solar Wind ◽  
Pickup Ions

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.

Inner Source C+/O+ Pickup Ions Produced by Solar Wind Recycling, Neutralization, Backscattering, Sputtering, and Sputtering-induced Recycling

2018 ◽  
Vol 861 (2) ◽  
pp. 98 ◽  
Author(s):  
P. R. Quinn ◽  
N. A. Schwadron ◽  
E. Möbius ◽  
A. Taut ◽  
L. Berger
Keyword(s):  
Solar Wind ◽  
Pickup Ions

TAUS measurements of non-gyrotropic distribution functions of solar wind alpha particles

1996 ◽  
Author(s):  
H. F. Astudillo ◽  
E. Marsch ◽  
S. Livi ◽  
H. Rosenbauer
Keyword(s):  
Solar Wind ◽  
Distribution Functions ◽  
Alpha Particles

scholarly journals The Effect of Magnetic Turbulence Energy Spectra and Pickup Ions on the Heating of the Solar Wind

2010 ◽  
Author(s):  
C. S. Ng ◽  
A. Bhattacharjee ◽  
P. A. Isenberg ◽  
D. Munsi ◽  
C. W. Smith ◽  
...  
Keyword(s):  
Solar Wind ◽  
Energy Spectra ◽  
Turbulence Energy ◽  
Pickup Ions ◽  
Magnetic Turbulence
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