The pressure-relevance of suprathermal solar wind electrons for the heliosheath

2020 ◽  
Author(s):  
Hans-Jörg Fahr
Keyword(s):  
Solar Wind ◽  
Interstellar Medium ◽  
Termination Shock ◽  
Solar Wind Termination Shock ◽  
Non Equilibrium

<p>In this presentation solar wind electrons and protons are studied which, after their passage over the solar wind termination shock, are convected downstream into the heliosheath. Due to the electric nature of this shock, downstream electrons appear highly energized with non-equilibrium,  kappa-like  distributions . When looking upon the moments of these downstream electrons and protons, it turns out as a surprise that the pressure of the electrons, compared to the protons, is larger by a factor of 2. Then it is taken into account that the pressure of kappa-distributed particles contains contributions from particles with super-luminal velocities which need to be removed from the pressure values . Even when these reductions are carried out, it is manifest that the heliosheath pressures of electrons and protons are of equal orders of magnitudes. In conclusion it is found that there is no pressure deficit in the heliosheath with respect to the ambient interstellar medium.</p>

scholarly journals Effects of the solar wind termination shock and heliosheath on theheliospheric modulation of galactic and anomalous Helium

2004 ◽  
Vol 22 (8) ◽  
pp. 3063-3072 ◽  
Author(s):  
U. W. Langner ◽  
M. S. Potgieter
Keyword(s):  
Solar Wind ◽  
Cosmic Ray ◽  
Magnetic Polarity ◽  
Termination Shock ◽  
Shock Acceleration ◽  
Diffusive Shock Acceleration ◽  
Cosmic Ray Modulation ◽  
Low Energies ◽  
Solar Wind Termination Shock ◽  
Charge Sign

Abstract. The interest in the role of the solar wind termination shock and heliosheath in cosmic ray modulation studies has increased significantly as the Voyager 1 and 2 spacecraft approach the estimated position of the solar wind termination shock. The effect of the solar wind termination shock on charge-sign dependent modulation, as is experienced by galactic cosmic ray Helium (He++) and anomalous Helium (He+), is the main topic of this work, and is complementary to the previous work on protons, anti-protons, electrons, and positrons. The modulation of galactic and anomalous Helium is studied with a numerical model including a more fundamental and comprehensive set of diffusion coefficients, a solar wind termination shock with diffusive shock acceleration, a heliosheath and particle drifts. The model allows a comparison of modulation with and without a solar wind termination shock and is applicable to a number of cosmic ray species during both magnetic polarity cycles of the Sun. The modulation of Helium, including an anomalous component, is also done to establish charge-sign dependence at low energies. We found that the heliosheath is important for cosmic ray modulation and that its effect on modulation is very similar for protons and Helium. The local Helium interstellar spectrum may not be known at energies

SENSING THE SOLAR-WIND TERMINATION SHOCK FROM EARTH'S ORBIT

1992 ◽  
pp. 365-368 ◽  
Author(s):  
K.C. Hsieh ◽  
K.L. Shih ◽  
J.R. Jokipii ◽  
M.A. Gruntman
Keyword(s):  
Solar Wind ◽  
Termination Shock ◽  
Solar Wind Termination Shock

Electrostatic Waves Observed At and Near the Solar Wind Termination Shock By Voyager 2

2008 ◽  
Author(s):  
D. A. Gurnett ◽  
W. S. Kurth ◽  
L. F. Burlaga ◽  
M. H. Acuna ◽  
N. F. Ness ◽  
...  
Keyword(s):  
Solar Wind ◽  
Termination Shock ◽  
Electrostatic Waves ◽  
Voyager 2 ◽  
Solar Wind Termination Shock
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