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Title: THE HELIOTAIL

Journal Article · · Astrophysical Journal Letters
;  [1];  [2]
  1. Department of Space Sciences, The University of Alabama in Huntsville, AL 35805 (United States)
  2. Center for Space Plasma and Aeronomic Research, The University of Alabama in Huntsville, AL 35805 (United States)

The heliotail is formed when the solar wind (SW) interacts with the local interstellar medium (LISM) and is shaped by the interstellar magnetic field (ISMF). While there are no spacecraft available to perform in situ measurements of the SW plasma and heliospheric magnetic field (HMF) in the heliotail, it is of importance for the interpretation of measurements of energetic neutral atom fluxes performed by Interstellar Boundary Explorer. It has been shown recently that the orientation of the heliotail in space and distortions of the unperturbed LISM caused by its presence may explain the anisotropy in the TeV cosmic ray flux detected in air shower observations. The SW flow in the heliotail is a mystery itself because it is strongly affected by charge exchange between the SW ions and interstellar neutral atoms. If the angle between the Sun’s magnetic and rotation axes is constant, the SW in the tail tends to be concentrated inside the HMF spirals deflected tailward. However, the twisted field soon becomes unstable and the reason for the SW collimation within a two-lobe structure vanishes. We demonstrate that kinetic treatment of the H atom transport becomes essential in this case for explaining the lobe absence further along the tail. We show that the heliotail flow is strongly affected by the solar cycle that eliminates artifacts, which is typical of solutions based on simplifying assumptions. The heliopause in the tail is subject to Kelvin–Helmholtz instability, while its orientation and shape are determined by the ISMF direction and strength.

OSTI ID:
22518850
Journal Information:
Astrophysical Journal Letters, Vol. 812, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
Country of Publication:
United States
Language:
English

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3D dynamics and morphology of bow-shock pulsar wind nebulae journal January 2019
Simulation of the Solar Wind Dynamic Pressure Increase in 2014 and Its Effect on Energetic Neutral Atom Fluxes from the Heliosphere journal May 2018
The Heliosphere Is Not Round journal July 2018
Constraining the Evolution of the Proton Distribution Function in the Heliotail journal October 2018
Globally Distributed Energetic Neutral Atom Maps for the “Croissant” Heliosphere journal September 2018
Expanding Global Features in the Outer Heliosphere journal February 2019
Magnetic Turbulence Spectra and Intermittency in the Heliosheath and in the Local Interstellar Medium journal February 2019
The Original Anisotropy of TeV Cosmic Rays in the Local Interstellar Medium journal January 2020
Predicting the Solar Wind at the Parker Solar Probe Using an Empirically Driven MHD Model journal February 2020
Heliosheath Processes and the Structure of the Heliopause: Modeling Energetic Particles, Cosmic Rays, and Magnetic Fields text January 2017
Constraining the Evolution of the Proton Distribution Function in the Heliotail text January 2018
Extended MHD modeling of the steady solar corona and the solar wind text January 2018
Predicting the Solar Wind at Parker Solar Probe Using an Empirically Driven MHD Model text January 2019