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Title: PROBING THE NATURE OF THE HELIOSHEATH WITH THE NEUTRAL ATOM SPECTRA MEASURED BY IBEX IN THE VOYAGER 1 DIRECTION

We are able to show by comparing modeled energetic neutral atoms (ENAs) spectra to those measured by Interstellar Boundary Explorer (IBEX) that the models along the Voyager 1 (V1) trajectory that best agree with the low energy IBEX data include extra heating due to ram and magnetic energy in the quasi-stagnation region or a kappa ion distribution (with κ = 2.0) in the outer heliosheath. The model explored is the multi-ion, multi-fluid (MI-MF) which treats the pick-up ions and the thermal ion fluids with separate Maxwellian distributions. These effects are included ad hoc in the modeled ENA since they are not present in the model. These results indicate that the low energy spectra of ENAs as measured by IBEX is sensitive to the physical nature of the heliosheath and to effects not traditionally present in current global models. Therefore, by comparing the low energy ENA spectra to models, we can potentially probe the heliosheath in locations beyond those probed by V1 and Voyager 2 (V2)
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Astronomy Department, Boston University, 725 Commonwealth Avenue, Boston, MA (United States)
  2. Southwest Research Institute, San Antonio, TX 78238 (United States)
  3. Department of Physics and Space Science Center, University of New Hampshire, Durham, NH 03824 (United States)
  4. Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742 (United States)
Publication Date:
OSTI Identifier:
22215427
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 776; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATOMS; DISTRIBUTION; ENERGY SPECTRA; HEATING; MAGNETOHYDRODYNAMICS; PROBES; SOLAR WIND; TRAJECTORIES; VOYAGER SPACE PROBES