Solar wind protons, alpha particles and electrons in the shock wave and the potential barrier (The intershock project)

1989 ◽  
Vol 39 (5) ◽  
pp. 569-576 ◽  
Author(s):  
G. N. Zastenker ◽  
O. L. Vaisberg ◽  
Z. Němeček ◽  
J. Šafránková ◽  
V. N. Smirnov ◽  
...  
Keyword(s):  
Shock Wave ◽  
Solar Wind ◽  
Potential Barrier ◽  
Alpha Particles

The double shock wave structure in the solar wind

1967 ◽  
Vol 72 (21) ◽  
pp. 5275-5286 ◽  
Author(s):  
G. Schubert ◽  
W. D. Cummings
Keyword(s):  
Shock Wave ◽  
Solar Wind ◽  
Wave Structure ◽  
Shock Wave Structure

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.

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

Electron energization in lunar magnetospheres

2010 ◽  
Vol 76 (6) ◽  
pp. 915-918 ◽  
Author(s):  
R. BINGHAM ◽  
R. BAMFORD ◽  
B. J. KELLETT ◽  
V. D. SHAPIRO
Keyword(s):  
Shock Wave ◽  
Solar Wind ◽  
Bow Shock ◽  
Lower Hybrid ◽  
Wave Fields ◽  
Resonant Interactions ◽  
Hybrid Waves ◽  
Lower Hybrid Waves ◽  
Turbulent Wave ◽  
Stream Instability

AbstractThe interaction of the solar wind with lunar surface magnetic fields produces a bow shock and a magnetosphere-like structure. In front of the shock wave energetic electrons up to keV energies are produced. This paper describes how resonant interactions between plasma turbulence in the form of lower-hybrid waves and electrons can result in field aligned electron acceleration. The turbulent wave fields close to the lower-hybrid resonant frequency are excited most probably by the modified two-stream instability, driven by the solar wind ions that are reflected and deflected by the low shock.

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