کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8142598 | 1523910 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Loss rates of Europa׳s tenuous atmosphere
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Loss rates of Europa׳s tenuous atmosphere Loss rates of Europa׳s tenuous atmosphere](/preview/png/8142598.png)
چکیده انگلیسی
Loss processes in Europa's tenuous atmosphere are dominated by plasma-neutral interactions. Based on the updated data of the plasma conditions in the vicinity of Europa (Bagenal et al. 2015), we provide estimations of the atmosphere loss rates for the H2O, O2 and H2 populations. Due to the high variability of the plasma proprieties, we perform our investigation for three sample plasma environment cases identified by Bagenal et al. as hot/low density, cold/high density, and an intermediate case. The role of charge-exchange interactions between atmospheric neutrals and three different plasma populations, i.e. magnetospheric, pickup, and ionospheric ions, is examined in detail. Our assumptions related to the pickup and to the ionospheric populations are based on the model by Sittler et al. (2013). We find that O2-O2+ charge-exchange is the fastest loss process for the most abundant atmospheric species O2, though this loss process has been neglected in previous atmospheric models. Using both the revised O2 column density obtained from the EGEON model (Plainaki et al., 2013) and the current loss rate estimates, we find that the upper limit for the volume integrated loss rate due to O2-O2+ charge exchange is in the range (13-51)Ã1026 sâ1, depending on the moon׳s orbital phase and illumination conditions. The results of the current study are relevant to the investigation of Europa's interaction with Jupiter׳s magnetospheric plasma.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Planetary and Space Science - Volume 130, 1 October 2016, Pages 14-23
Journal: Planetary and Space Science - Volume 130, 1 October 2016, Pages 14-23
نویسندگان
Alice Lucchetti, Christina Plainaki, Gabriele Cremonese, Anna Milillo, Timothy Cassidy, Xianzhe Jia, Valery Shematovich,