Thickness of the heliosheath, return of the pick-up ions, and voyager 1's crossing the heliopause

K. C. Hsieh, Joe Giacalone, A. Czechowski, M. Hilchenbach, S. Grzedzielski, J. Kota

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

abs Using results of remote sensing by energetic neutral atoms from IBEX, SOHO/HSTOF, and Cassini/INCA, in situ measurements of ∼40-4000 keV protons in the heliosheath (HS) from Low Energy Charged Particle on Voyager 1 and Voyager 2, and outputs from numerical modeling of the termination shock, we estimate L, the characteristic thickness of the HS in the "upwind" direction (±45° in ecliptic longitude of the Nose at λ = 255°). A simple steady-state, internally consistent model gives L = 21 ± 6 AU for Voyager 1, L = 28 ± 8 AU for Voyager 2, and L = 25 ± 8 AU assuming that the same L value is valid for both spacecraft. We recognize that this is a very coarse cut at a very dynamic region of the heliosphere; but if the lower value L = 21 AU applies, one could expect Voyager 1 to cross the heliopause as early as late 2010.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume718
Issue number2 PART 2
DOIs
StatePublished - Aug 1 2010

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ecliptic
heliosphere
neutral atoms
longitude
in situ measurement
remote sensing
charged particles
spacecraft
energetics
shock
protons
ion
output
estimates
modeling
energy
ions
particle

Keywords

  • Acceleration of particles-methods
  • Data analysis-plasmas-shock waves-space vehicles
  • Heliosphere
  • Instruments-Sun

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Thickness of the heliosheath, return of the pick-up ions, and voyager 1's crossing the heliopause. / Hsieh, K. C.; Giacalone, Joe; Czechowski, A.; Hilchenbach, M.; Grzedzielski, S.; Kota, J.

In: Astrophysical Journal Letters, Vol. 718, No. 2 PART 2, 01.08.2010.

Research output: Contribution to journalArticle

Hsieh, K. C. ; Giacalone, Joe ; Czechowski, A. ; Hilchenbach, M. ; Grzedzielski, S. ; Kota, J. / Thickness of the heliosheath, return of the pick-up ions, and voyager 1's crossing the heliopause. In: Astrophysical Journal Letters. 2010 ; Vol. 718, No. 2 PART 2.
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