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Methane in the lunar exosphere: Implications for solar wind carbon escape

Hodges, R. Richard

Geophysical research letters, 2016-07, Vol.43 (13), p.6742-6748 [Periódico revisado por pares]

Washington: John Wiley & Sons, Inc

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Título:
Methane in the lunar exosphere: Implications for solar wind carbon escape
Autor: Hodges, R. Richard
Assuntos: Activation energy ; Altitude ; Argon ; Atmosphere ; Atmospheric particulates ; Carbon ; Desorption ; Dust ; Dust storms ; escape ; Exosphere ; Identification ; Lunar atmosphere ; Lunar dust ; Lunar exosphere ; Lunar exploration ; Lunar spacecraft ; Lunar surface ; Mass ; Methane ; Moon ; Night ; Night-time ; Nighttime ; Physiographic features ; Solar physics ; Solar wind ; Spacecraft ; Sunrise
É parte de: Geophysical research letters, 2016-07, Vol.43 (13), p.6742-6748
Notas: ObjectType-Article-1
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Descrição: A positive identification of methane in the lunar exosphere has been made in data from the neutral mass spectrometer on the Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft. Like argon‐40, methane is adsorbed on the lunar surface during nighttime. However, higher activation energies for methane delay its desorption at sunrise by about an hour local time, creating a postsunrise bulge with peak concentration of approximately 400–450 molecules cm−3 at a reference altitude of 12 km, which is just above the highest topographic feature on the Moon. The rate of escape of carbon as methane derived from the LADEE data is estimated to be in the range 1.5–4.5 × 1021 s−1. A lower bound for solar carbon escape derived separately from Apollo sample analyses is 3.4 × 1021 s−1. Key Points Methane has been discovered in the lunar exosphere Methane escape accounts for about half of the solar carbon influx Activation energy for methane (and other molecules) adsorption is twice that for argon‐40
Editor: Washington: John Wiley & Sons, Inc
Idioma: Inglês

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Methane in the lunar exosphere: Implications for solar wind carbon escape

Hodges, R. Richard

Washington: John Wiley & Sons, Inc

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