Computer Science
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002icar..156..136j&link_type=abstract
Icarus, Volume 156, Issue 1, pp. 136-142 (2002).
Computer Science
27
Scientific paper
The sputtering and decomposition of the surface of Europa by fast ions and electrons lead to the production of an atomosphere containing sodium and potassium atoms. Here time-of-flight energy distributions are measured for Na and K sputtered from a vapor-deposited ice by 200-eV electrons. These data are then used in a Monte Carlo simulation for alkalis in Europa's atmosphere. Na/K ratios versus distance from Europa are calculated and compared to the recent observations in the range 6 to 18 Europan radii from the surface. Normalizing to the observations, the Na/K ratio for the loss rates is ~27 and the ratio for the average surface source rates is ~20. These ratios are very different from the Na/K ratio at Io and are larger than the Na/K ratio suggested for Europa's putative subsurface ocean, consistent with fractionation on freezing and upwelling of ocean material. .
Johnson Robert E.
LeBlanc Francis
Madey Theodore E.
Yakshinskiy Boris V.
No associations
LandOfFree
Energy Distributions for Desorption of Sodium and Potassium from Ice: The Na/K Ratio at Europa does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Energy Distributions for Desorption of Sodium and Potassium from Ice: The Na/K Ratio at Europa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy Distributions for Desorption of Sodium and Potassium from Ice: The Na/K Ratio at Europa will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-782839