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The ion environment near Europa and its role in surface energetics

Paranicas, C. and Mauk, B. H. and Ratliff, J. M. and Cohen, C. M. S. and Johnson, R. E. (2002) The ion environment near Europa and its role in surface energetics. Geophysical Research Letters, 29 (5). 18/1-18/4. ISSN 0094-8276. doi:10.1029/2001GL014127.

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This paper gives the composition, energy spectra, and time variability of energetic ions measured just upstream of Europa. From 100 keV to 100 MeV, ion intensities vary by less than a factor of ∼5 among Europa passes considered between 1997 and 2000. We use the data to estimate the radiation dose rate into Europa's surface for depths 0.01 mm – 1 m. We find that in a critical fraction of the upper layer on Europa's trailing hemisphere, energetic electrons are the principal agent for radiolysis, and their bremsstrahlung photon products, not included in previous studies, dominate the dose below about 1 m. Because ion bombardment is more uniform across Europa's surface, the radiation dose on the leading hemisphere is dominated by the proton flux. Differences exist between this calculation and published doses based on the E4 wake pass. For instance, proton doses presented here are much greater below 1 mm.

Item Type:Article
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Cohen, C. M. S.0000-0002-0978-8127
Additional Information:© 2002 American Geophysical Union. Received 24 September 2001; revised 8 January 2002; accepted 9 January 2002; published 14 March 2002. The research presented here was carried out under contracts between NASA and the various member institutions.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2002-03
Issue or Number:5
Record Number:CaltechAUTHORS:20150304-100309484
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Official Citation:Paranicas, C., J. M. Ratliff, B. H. Mauk, C. M. S. Cohen, and R. E. Johnson, The ion environment near Europa and its role in surface energetics, Geophys. Res. Lett., 29(5), doi:10.1029/2001GL014127, 2002.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55506
Deposited By: Deborah Miles
Deposited On:04 Mar 2015 21:53
Last Modified:10 Nov 2021 20:46

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