Martian planetary heavy ion sputtering of Phobos

The Martian moons, Phobos and Deimos, have long been suspected to be the sources of tenuous neutral gas tori encircling Mars. While direct outgassing has been ruled out as a strong source, micrometeoroid impact vaporization and charged particle sputtering must operate based on observations at other...

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Published in	Geophysical research letters Vol. 41; no. 18; pp. 6335 - 6341
Main Authors	Poppe, A. R., Curry, S. M.
Format	Journal Article
Language	English
Published	Washington Blackwell Publishing Ltd 28.09.2014 John Wiley & Sons, Inc
Subjects	Atmospheric models Charged particles Deimos Evolution Fluctuations Flux Ion flux ion sputtering Ions Magnetohydrodynamics Mars Mars atmospheric loss Mars satellites Mathematical models Moons Outgassing Phobos Phobos neutral torus Solar wind Space exploration Sputtering Toruses Vaporization
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ISSN	0094-8276 1944-8007
DOI	10.1002/2014GL061100

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Abstract	The Martian moons, Phobos and Deimos, have long been suspected to be the sources of tenuous neutral gas tori encircling Mars. While direct outgassing has been ruled out as a strong source, micrometeoroid impact vaporization and charged particle sputtering must operate based on observations at other airless bodies. Previous models have addressed solar wind sputtering of Phobos; however, Phobos and Deimos are also subject to a significant, yet temporally variable, flux of heavy planetary ions escaping from Mars. In this report, we use a combination MHD/test‐particle model to calculate the planetary heavy ion flux to Phobos and the ensuing neutral sputtered flux. Depending on ambient solar wind conditions and the location of Phobos, heavy ion sputtering of Phobos generates neutral fluxes up to and exceeding that from solar wind sputtering. We model pickup ions from the Phobos torus itself with applications for observations by the upcoming Mars Atmospheric and Volatile Evolution mission. Key Points We assess neutral sputtering of Phobos by escaping Martian O+ ionsMartian O+ sputters at rates larger than solar wind depending on SW conditionsMAVEN may detect the Phobos torus via newly generated torus pickup ions
AbstractList	The Martian moons, Phobos and Deimos, have long been suspected to be the sources of tenuous neutral gas tori encircling Mars. While direct outgassing has been ruled out as a strong source, micrometeoroid impact vaporization and charged particle sputtering must operate based on observations at other airless bodies. Previous models have addressed solar wind sputtering of Phobos; however, Phobos and Deimos are also subject to a significant, yet temporally variable, flux of heavy planetary ions escaping from Mars. In this report, we use a combination MHD/test-particle model to calculate the planetary heavy ion flux to Phobos and the ensuing neutral sputtered flux. Depending on ambient solar wind conditions and the location of Phobos, heavy ion sputtering of Phobos generates neutral fluxes up to and exceeding that from solar wind sputtering. We model pickup ions from the Phobos torus itself with applications for observations by the upcoming Mars Atmospheric and Volatile Evolution mission. The Martian moons, Phobos and Deimos, have long been suspected to be the sources of tenuous neutral gas tori encircling Mars. While direct outgassing has been ruled out as a strong source, micrometeoroid impact vaporization and charged particle sputtering must operate based on observations at other airless bodies. Previous models have addressed solar wind sputtering of Phobos; however, Phobos and Deimos are also subject to a significant, yet temporally variable, flux of heavy planetary ions escaping from Mars. In this report, we use a combination MHD/test-particle model to calculate the planetary heavy ion flux to Phobos and the ensuing neutral sputtered flux. Depending on ambient solar wind conditions and the location of Phobos, heavy ion sputtering of Phobos generates neutral fluxes up to and exceeding that from solar wind sputtering. We model pickup ions from the Phobos torus itself with applications for observations by the upcoming Mars Atmospheric and Volatile Evolution mission. Key Points * We assess neutral sputtering of Phobos by escaping Martian O+ ions * Martian O+ sputters at rates larger than solar wind depending on SW conditions * MAVEN may detect the Phobos torus via newly generated torus pickup ions The Martian moons, Phobos and Deimos, have long been suspected to be the sources of tenuous neutral gas tori encircling Mars. While direct outgassing has been ruled out as a strong source, micrometeoroid impact vaporization and charged particle sputtering must operate based on observations at other airless bodies. Previous models have addressed solar wind sputtering of Phobos; however, Phobos and Deimos are also subject to a significant, yet temporally variable, flux of heavy planetary ions escaping from Mars. In this report, we use a combination MHD/test‐particle model to calculate the planetary heavy ion flux to Phobos and the ensuing neutral sputtered flux. Depending on ambient solar wind conditions and the location of Phobos, heavy ion sputtering of Phobos generates neutral fluxes up to and exceeding that from solar wind sputtering. We model pickup ions from the Phobos torus itself with applications for observations by the upcoming Mars Atmospheric and Volatile Evolution mission. Key Points We assess neutral sputtering of Phobos by escaping Martian O+ ionsMartian O+ sputters at rates larger than solar wind depending on SW conditionsMAVEN may detect the Phobos torus via newly generated torus pickup ions
Author	Poppe, A. R. Curry, S. M.
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Cites_doi	10.1016/S0168-583X(98)00399-1 10.1016/j.icarus.2011.01.036 10.1029/2003JA010367 10.1029/GL017i006p00857 10.1038/35084184 10.1029/2000JE001365 10.1029/90JA01753 10.1029/GL017i006p00861 10.1002/2014GL059515 10.1029/1999GL010703 10.1016/j.icarus.2009.07.017 10.1038/341604a0 10.1029/2007JE002915 10.1029/2001JA000328 10.1016/0032-0633(91)90133-U 10.1007/BF00614759 10.1016/j.icarus.2011.08.003 10.1016/j.icarus.2005.02.013 10.1016/j.icarus.2005.09.020 10.1002/2013JA019221 10.1016/j.icarus.2009.01.012 10.1007/BF00644558 10.1029/GL016i004p00287 10.1016/j.pss.2006.05.009 10.1029/2001JA000125 10.1002/jgra.50358 10.1016/0019-1035(88)90148-0 10.1016/j.nimb.2010.11.091 10.1126/science.269.5227.1075 10.1029/91GL02095 10.1029/JA086iA08p06926 10.1029/2012JA017665 10.1029/2007JA012736
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Snippet	The Martian moons, Phobos and Deimos, have long been suspected to be the sources of tenuous neutral gas tori encircling Mars. While direct outgassing has been...
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SubjectTerms	Atmospheric models Charged particles Deimos Evolution Fluctuations Flux Ion flux ion sputtering Ions Magnetohydrodynamics Mars Mars atmospheric loss Mars satellites Mathematical models Moons Outgassing Phobos Phobos neutral torus Solar wind Space exploration Sputtering Toruses Vaporization
Title	Martian planetary heavy ion sputtering of Phobos
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