Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko
碩士 === 國立中央大學 === 天文研究所 === 105 === Thanks to the Rosetta Mission, we have an opportunity to study comet 67P/C-G in the long journey from Aug. 2014 to the end of Sep. 2016. This is the first time to orbit and land on the comet. According to Feldman et al. (2015) and Bodewits et al. (2016), some of t...
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ndltd-TW-105NCU051990022019-05-15T23:17:15Z http://ndltd.ncl.edu.tw/handle/erfmw8 Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko Chen-En Wei 魏辰恩 碩士 國立中央大學 天文研究所 105 Thanks to the Rosetta Mission, we have an opportunity to study comet 67P/C-G in the long journey from Aug. 2014 to the end of Sep. 2016. This is the first time to orbit and land on the comet. According to Feldman et al. (2015) and Bodewits et al. (2016), some of the atomic and molecular emissions such as O1, H1, OH, etc. might be attributed to electron impact dissociation. As a result, we want to understand the effect of the electron impact mechanism on the cometary coma. An ion-neutral chemical model in used to estimate the number density ratio of H3O+/H2O+ under different physical conditions. For the model setting, to account for the seasonal effect, we consider two heliocentric distances: 3 AU and 1.2 AU, i.e., the perihelion, respectively. The surface composition of the comet in further divided into two parts: the Northern and Southern hemisphere. We also use three different electron energy spectra (Maxwellian distribution/ source spectra due to the photoionization/ observation from Rosetta ) to simulate the resultant coma structure. Wing-Huen Ip 葉永烜 2017 學位論文 ; thesis 130 en_US |
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碩士 === 國立中央大學 === 天文研究所 === 105 === Thanks to the Rosetta Mission, we have an opportunity to study comet 67P/C-G in the long journey from Aug. 2014 to the end of Sep. 2016. This is the first time to orbit and land on the comet.
According to Feldman et al. (2015) and Bodewits et al. (2016), some of the atomic and molecular emissions such as O1, H1, OH, etc. might be attributed to electron impact dissociation. As a result, we want to understand the effect of the electron impact mechanism on the cometary coma. An ion-neutral chemical model in used to estimate the number density ratio of H3O+/H2O+ under different physical conditions.
For the model setting, to account for the seasonal effect, we consider two heliocentric distances: 3 AU and 1.2 AU, i.e., the perihelion, respectively. The surface composition of the comet in further divided into two parts: the Northern and Southern hemisphere. We also use three different electron energy spectra (Maxwellian distribution/ source spectra due to the photoionization/ observation from Rosetta ) to simulate the resultant coma structure.
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author2 |
Wing-Huen Ip |
author_facet |
Wing-Huen Ip Chen-En Wei 魏辰恩 |
author |
Chen-En Wei 魏辰恩 |
spellingShingle |
Chen-En Wei 魏辰恩 Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko |
author_sort |
Chen-En Wei |
title |
Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko |
title_short |
Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko |
title_full |
Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko |
title_fullStr |
Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko |
title_full_unstemmed |
Inner Coma Ionospheric Chemical Model of Comet 67P/ Churyumov-Gerasimenko |
title_sort |
inner coma ionospheric chemical model of comet 67p/ churyumov-gerasimenko |
publishDate |
2017 |
url |
http://ndltd.ncl.edu.tw/handle/erfmw8 |
work_keys_str_mv |
AT chenenwei innercomaionosphericchemicalmodelofcomet67pchuryumovgerasimenko AT wèichénēn innercomaionosphericchemicalmodelofcomet67pchuryumovgerasimenko |
_version_ |
1719144325253693440 |