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File:PIA16818-MarsCuriosityRover-Argon-AtmosphericLoss.png

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English: Argon Isotopes Provide Robust Signature of Atmospheric Loss

This image shows the ratio of the argon isotope argon-36 to the heavier argon isotope argon-38, in various measurements. The point farthest to the right designates a new (2013) measurement of the ratio in the atmosphere of Mars, made by the quadrupole mass spectrometer in the Sample Analysis at Mars (SAM) suite of instruments in NASA's Curiosity Mars rover. For comparison, the previous measurement at Mars by the Mars Viking project in 1976 is shown also. The SAM result is at the lower end of the range of uncertainty of the Viking data, but compares well with ratios of argon istotopes from some Mars meteorites. The value determined by SAM is significantly lower than the value in the sun, Jupiter and Earth, which implies loss of the lighter isotope compared to the heavier isotope over geologic time. The argon isotope fractionation provides clear evidence of the loss of atmosphere from Mars.

Image Addition Date:

2013-04-08
Date
Source http://photojournal.jpl.nasa.gov/catalog/PIA16818
Author NASA/JPL-Caltech
This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA16818.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Date/TimeThumbnailDimensionsUserComment
current00:49, 28 November 2013Thumbnail for version as of 00:49, 28 November 2013960 × 720 (157 KB)Ras67=={{int:filedesc}}== {{Information |description={{en|1='''Argon Isotopes Provide Robust Signature of Atmospheric Loss'''<br/> This image shows the ratio of the argon isotope argon-36 to the heavier argon isotope argon-38, in various measurements. The...

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