“Phobos events”—Signatures of solar wind interaction with a gas torus?

Baumgärtel, K.; Sauer, K.; Dubinin, E.; Tarrasov, V.; Dougherty, M. K.

doi:10.1186/bf03352133

Cited by 18 publications

(18 citation statements)

References 30 publications

(33 reference statements)

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“…In the solar wind reference frame, the unmagnetized heavy ions appear as a beam distribution streaming through the solar wind. It has been shown extensively in the literature that such a configuration leads to the excitation of low‐frequency electromagnetic waves (LFEW) at roughly the proton gyrofrequency [ Sauer et al , 1996, 1998a, 1998b, 1999a, 1999b; Dubinin and Sauer , 1999; Baumgärtel et al , 1998].…”

Section: Introductionmentioning

confidence: 99%

Hybrid code simulations of the solar wind interaction with Pluto

Delamere

2009

J. Geophys. Res.

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[1] Pluto's low gravity implies that the atmosphere is only weakly bound and that significant hydrodynamic outflow can exist. Though surface spectroscopy of Pluto has revealed methane frost, the dominant escaping neutral gas is thought to be N 2 . These escaping neutrals are photoionized, and the heavy ions (N 2 + ) move away from Pluto in the direction perpendicular to the solar wind flow (i.e., nearly unmagnetized relative to the length scales of the plasma interaction region). The turning distance of the solar wind protons at the magnetic pileup boundary is large compared to the interaction region. As a result, large ion gyroradius effects determine Pluto's highly asymmetric interaction with the solar wind. We use a three-dimensional hybrid code (fluid electrons, kinetic ions) to investigate the geometry of the interaction region for a variety of possible atmospheric escape rates in anticipation of the New Horizons encounter with Pluto. We find considerable structuring in the wake region due to bi-ion waves and Kelvin-Helmholtz waves. The shock structures vary from a simple Mach cone for low escape rates ($2 Â 10 26 s À1 ) to a full detached bow shock for large escape rates ($2 Â 10 28 s À1).

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Section: Introductionmentioning

confidence: 99%

Hybrid code simulations of the solar wind interaction with Pluto

Delamere

2009

J. Geophys. Res.

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“…With no detection of oxygen ions from a distance of 100 km, the upper limit for Phobos outgassing is set at < 10 20 s -1 . A detection was reported by Dubinin et al, (1990;1991) and Baumgärtel et al, (1998) using the Phobos-2 magnetometer data. On the contrary, Øieroset et al, (2010) found no direct evidences in the Mars Global Surveyor magnetometer data to support the idea of a significant outgassing or dust escape from the Phobos surface.…”

Section: Ejecta Production Re-accumulation and Ring Formationmentioning

confidence: 96%

DePhine – The Deimos and Phobos Interior Explorer

Oberst

Wickhusen

Willner

et al. 2018

Advances in Space Research

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DePhine -Deimos and Phobos Interior Explorer -is a mission proposed in the context of ESA's Cosmic Vision program, for launch in 2030. The mission will explore the origin and the evolution of the two Martian satellites, by focusing on their interior structures and diversity, by addressing the following open questions: Are Phobos and Deimos true siblings, originating from the same source and sharing the same formation scenario? Are the satellites rubble piles or solid bodies? Do they possess hidden deposits of water ice in their interiors? The DePhine spacecraft will be inserted into Mars transfer and will initially enter a Deimos quasi-satellite orbit to carry out a comprehensive global mapping. The goal is to obtain physical parameters and remote sensing data for Deimos comparable to data expected to be available for Phobos at the time of the DePhine mission for comparative studies. As a highlight of the mission, close flybys will be performed at low velocities, which will increase data integration times, enhance the signal strength and data resolution. 10 -20 flyby sequences, including polar passes, will result in a dense global grid of observation tracks. The spacecraft orbit will then be changed into a Phobos resonance orbit to carry out multiple close flybys and to perform similar remote sensing as for Deimos. The spacecraft will carry a suite of remote sensing instruments, including a camera system, a radio science experiment, a high-frequency radar, a magnetometer, and a Gamma Ray / Neutron Detector. A steerable antenna will allow simultaneous radio tracking and remote sensing observations (which is technically not possible for Mars Express). Additional instrumentation, e.g. a dust detector and a solar wind sensor, will address ---further science goals of the mission. If Ariane 6-2 and higher lift performance are available for launch (the baseline mission assumes a launch on a Soyuz Fregat), we expect to have greater spacecraft mobility and possibly added payloads.

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“…(The excitation of low-frequency electromagnetic waves by an unmagnetized beam of heavy ions in a plasma of magnetized electrons and protons is a topic of separate papers by Baumgärtel et al (1998) and Sauer et al (1998).) Taking in Eq.…”

Section: D Bi-ion Mhd Simulationsmentioning

confidence: 99%

Nonlinear MHD waves and discontinuities in the Martian magnetosheath. Observations and 2D bi-ion MHD simulations

2014

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The characteristic scale of the Martian magnetosheath is less than the pick-up gyroradius of oxygen ions. This leads to admissible differential motion of protons and heavies and a strong coupling between both ion fluids. 2D biion MHD simulations reveal many new interesting features in such Large Larmour Radius systems. The formation of an ion-composition boundary, which separates both plasmas, and structuring of the transition from proton dominated plasma of the solar wind origin to massive planetary plasma are the main features of the interaction. A comprehensive multi-instrument study of Martian plasma environment and the comparison with theoretical modelling initiated in the framework of the Visiting Science Programme of the International Space Science Institute (ISSI) in Bern (Switzerland) gives confirmation that Mars interacts with the solar wind like a comet which has a outgassing rate near to that of Grigg-Skjellerup. The results may also be relevant for small bodies which are surrounded by a neutral gas atmosphere (icy moons, asteroids, Mercury).

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“Phobos events”—Signatures of solar wind interaction with a gas torus?

Cited by 18 publications

References 30 publications

Hybrid code simulations of the solar wind interaction with Pluto

Hybrid code simulations of the solar wind interaction with Pluto

DePhine – The Deimos and Phobos Interior Explorer

Nonlinear MHD waves and discontinuities in the Martian magnetosheath. Observations and 2D bi-ion MHD simulations

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