Plasma pressures in the heliosheath from Cassini ENA and Voyager 2 measurements: Validation by the Voyager 2 heliopause crossing. (arXiv:1907.03425v1 [physics.space-ph])

Plasma pressures in the heliosheath from Cassini ENA and Voyager 2 measurements: Validation by the Voyager 2 heliopause crossing. (arXiv:1907.03425v1 [physics.space-ph])
<a href="http://arxiv.org/find/physics/1/au:+Dialynas_K/0/1/0/all/0/1">K. Dialynas</a>, <a href="http://arxiv.org/find/physics/1/au:+Krimigis_S/0/1/0/all/0/1">S. M. Krimigis</a>, <a href="http://arxiv.org/find/physics/1/au:+Decker_R/0/1/0/all/0/1">R. B. Decker</a>, <a href="http://arxiv.org/find/physics/1/au:+Mitchell_D/0/1/0/all/0/1">D. G. Mitchell</a>

We report “ground truth”, 28-3500 keV in-situ ion and 5.2-55 keV remotely
sensed ENA measurements from Voyager 2/Low Energy Charged Particle (LECP)
detector and Cassini/Ion and Neutral Camera (INCA), respectively, that assess
the components of the ion pressure in the heliosheath. In this process, we
predict an interstellar neutral hydrogen density of ~0.12 cm-3 and an
interstellar magnetic field strength of ~0.5 nT upstream of the heliopause in
the direction of V2, i.e. consistent with the measured magnetic field and
neutral density measurements at Voyager 1 from August 2012, when the spacecraft
entered interstellar space, to date. Further, this analysis results in an
estimated heliopause crossing by V2 of ~119 AU, as observed, suggesting that
the parameters deduced from the pressure analysis are valid. The shape of the
>5.2 keV ion energy spectra play a critical role towards determining the
pressure balance and acceleration mechanisms inside the heliosheath.

We report “ground truth”, 28-3500 keV in-situ ion and 5.2-55 keV remotely
sensed ENA measurements from Voyager 2/Low Energy Charged Particle (LECP)
detector and Cassini/Ion and Neutral Camera (INCA), respectively, that assess
the components of the ion pressure in the heliosheath. In this process, we
predict an interstellar neutral hydrogen density of ~0.12 cm-3 and an
interstellar magnetic field strength of ~0.5 nT upstream of the heliopause in
the direction of V2, i.e. consistent with the measured magnetic field and
neutral density measurements at Voyager 1 from August 2012, when the spacecraft
entered interstellar space, to date. Further, this analysis results in an
estimated heliopause crossing by V2 of ~119 AU, as observed, suggesting that
the parameters deduced from the pressure analysis are valid. The shape of the
>5.2 keV ion energy spectra play a critical role towards determining the
pressure balance and acceleration mechanisms inside the heliosheath.

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