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Title: The effect of new interstellar medium parameters on the heliosphere and energetic neutral atoms from the interstellar boundary

Here we present new results from three-dimensional simulations of the solar wind interaction with the local interstellar medium (LISM) using recent observations by NASA's Interstellar Boundary EXplorer (IBEX) mission estimates of the velocity and temperature of the LISM. We investigate four strengths of the LISM magnetic field, from 1 to 4 μG, and adjust the LISM proton and hydrogen densities so that the distance to the termination shock (TS) in the directions of the Voyager spacecraft is just below 90 AU, and the density of hydrogen at the TS is close to 0.09 cm-3 in the nose direction. The orientation of the magnetic field is chosen to point toward the center of the ribbon of enhanced energetic neutral atom (ENA) flux seen in the IBEX data. Our simulations show that the plasma and neutral properties in the outer heliosheath vary considerably as a function of the LISM magnetic field strength. We also show that the heliotail points downwind in all cases, though its structure is strongly affected by the external magnetic field. Lastly, comparison and consistency between the simulated ENA flux and the circularity of the ribbon as measured by IBEX are most consistent with a LISM magnetic field strengthmore » aligned with the center of the ribbon and a magnitude in the range 2.5-3 μG.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Univ. of Alabama in Huntsville, AL (United States). Dept. of Space Science and Center for Space Plasma and Aeronomic Research (CSPAR)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Grant/Contract Number:
SC0008334; NNX09AG63G; NNX11AB48G; NNX12AH44G; NNX10AE46G; NNX12AB30G; N00173-10-1-G902
Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 784; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Research Org:
Univ. of Alabama, Huntsville, AL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Aeronautic and Space Administration (NASA); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; ISM: kinematics and dynamics; ISM: magnetic fields
OSTI Identifier:
1326047

Heerikhuisen, J., Zirnstein, E. J., Funsten, H. O., Pogorelov, N. V., and Zank, G. P.. The effect of new interstellar medium parameters on the heliosphere and energetic neutral atoms from the interstellar boundary. United States: N. p., Web. doi:10.1088/0004-637X/784/1/73.
Heerikhuisen, J., Zirnstein, E. J., Funsten, H. O., Pogorelov, N. V., & Zank, G. P.. The effect of new interstellar medium parameters on the heliosphere and energetic neutral atoms from the interstellar boundary. United States. doi:10.1088/0004-637X/784/1/73.
Heerikhuisen, J., Zirnstein, E. J., Funsten, H. O., Pogorelov, N. V., and Zank, G. P.. 2014. "The effect of new interstellar medium parameters on the heliosphere and energetic neutral atoms from the interstellar boundary". United States. doi:10.1088/0004-637X/784/1/73. https://www.osti.gov/servlets/purl/1326047.
@article{osti_1326047,
title = {The effect of new interstellar medium parameters on the heliosphere and energetic neutral atoms from the interstellar boundary},
author = {Heerikhuisen, J. and Zirnstein, E. J. and Funsten, H. O. and Pogorelov, N. V. and Zank, G. P.},
abstractNote = {Here we present new results from three-dimensional simulations of the solar wind interaction with the local interstellar medium (LISM) using recent observations by NASA's Interstellar Boundary EXplorer (IBEX) mission estimates of the velocity and temperature of the LISM. We investigate four strengths of the LISM magnetic field, from 1 to 4 μG, and adjust the LISM proton and hydrogen densities so that the distance to the termination shock (TS) in the directions of the Voyager spacecraft is just below 90 AU, and the density of hydrogen at the TS is close to 0.09 cm-3 in the nose direction. The orientation of the magnetic field is chosen to point toward the center of the ribbon of enhanced energetic neutral atom (ENA) flux seen in the IBEX data. Our simulations show that the plasma and neutral properties in the outer heliosheath vary considerably as a function of the LISM magnetic field strength. We also show that the heliotail points downwind in all cases, though its structure is strongly affected by the external magnetic field. Lastly, comparison and consistency between the simulated ENA flux and the circularity of the ribbon as measured by IBEX are most consistent with a LISM magnetic field strength aligned with the center of the ribbon and a magnitude in the range 2.5-3 μG.},
doi = {10.1088/0004-637X/784/1/73},
journal = {Astrophysical Journal},
number = 1,
volume = 784,
place = {United States},
year = {2014},
month = {3}
}