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Title: THE HELIOTAIL

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 themore » 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.« less
Authors:
;  [1] ;  [2] ;  [3]
  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)
  3. Department of Physics and Space Sciences, Florida Institute of Technology, Melbourne, FL 32901 (United States)
Publication Date:
OSTI Identifier:
22518850
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 812; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATOM TRANSPORT; ATOMS; CHARGE EXCHANGE; COSMIC RAY FLUX; HELIOSPHERE; HELMHOLTZ INSTABILITY; INTERSTELLAR MAGNETIC FIELDS; ORIENTATION; ROTATION; SOLAR CYCLE; SOLAR WIND; SPACE; SPACE VEHICLES; SUN; TEV RANGE