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Evolving Outer Heliosphere: Tracking Solar Wind Transients from 1 au to the VLISM with IBEX and Voyager 1

Journal Article · · The Astrophysical Journal
 [1];  [2];  [1];  [3];  [1];  [4];  [5];  [5]
  1. Princeton Univ., NJ (United States)
  2. Univ. of Alabama, Huntsville, AL (United States)
  3. Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas at San Antonio, TX (United States)
  4. Polish Academy of Sciences (PAS), Warsaw (Poland). Space Research Centre
  5. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
Interstellar Boundary Explorer (IBEX) observations of energetic neutral atom (ENA) fluxes from the heliosphere have greatly enriched our understanding of the interaction of the solar wind (SW) with the local interstellar medium (LISM). However, there has been recent controversy surrounding the inability of most ENA models to produce as high an intensity of ~0.5–6 keV ENAs as IBEX observes at 1 au, especially as a function of time. In our previous study (E. J. Zirnstein et al.), we introduced a new model that utilizes a data-driven magnetohydrodynamic simulation of the SW–LISM interaction to propagate pickup ions through the heliosheath (HS) after they are nonadiabatically heated at the heliospheric termination shock. E. J. Zirnstein et al. only simulated and analyzed IBEX observations from the direction of Voyager 2. In this study, we expand our model to include fluxes from the direction of Voyager 1, as well as in the low-latitude part (middle) of the ribbon (10° below the ecliptic plane). We show that the model results at Voyager 1 are consistent with E. J. Zirnstein et al.'s results at Voyager 2 in terms of a secondary ENA source contribution of ≲20% from both directions. Our results in the middle of the ribbon also reproduce the data, when including a time-dependent secondary ENA source. Finally, we demonstrate with our simulation that three large pressure waves likely merged in the VLISM and were observed by Voyager 1 as "pf2," while at least one of the wave's effects in the HS was observed by IBEX as a brief enhancement in ENA flux in early 2016.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2467567
Alternate ID(s):
OSTI ID: 2476037
Report Number(s):
LA-UR--24-28182
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 974; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
heliosheath
heliosphere
ion-neutral reactions
shocks
solar coronal mass ejections
solar cycle
solar wind
termination shock