Ultraviolet Observations of Coronal Mass Ejection Impact on Comet 67P/Churyumov-Gerasimenko by Rosetta Alice
| العنوان: | Ultraviolet Observations of Coronal Mass Ejection Impact on Comet 67P/Churyumov-Gerasimenko by Rosetta Alice |
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| المؤلفون: | Matthew M. Knight, Ronald J. Vervack, Joel Wm. Parker, Andrew J. Steffl, Jean-Loup Bertaux, Cyril Simon Wedlund, T. W. Broiles, Niklas J. T. Edberg, Paul D. Feldman, Michael F. A'Hearn, Brian A. Keeney, Eric Schindhelm, Harold A. Weaver, S. Alan Stern, John Noonan, Lori M. Feaga |
| المساهمون: | Department of Space Studies [Boulder], Southwest Research Institute [Boulder] (SwRI), Lunar and Planetary Laboratory [Tucson] (LPL), University of Arizona, Department of Physics and Astronomy [Baltimore], Johns Hopkins University (JHU), Space Science Institute [Boulder] (SSI), Department of Physics [Oslo], Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO), Swedish Institute of Space Physics [Uppsala] (IRF), Ball Aerospace and Technologies Corp., Johns Hopkins University Applied Physics Laboratory [Laurel, MD] (APL), Department of Astronomy [College Park], University of Maryland [College Park], University of Maryland System-University of Maryland System, PLANETO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| المصدر: | The Astronomical Journal The Astronomical Journal, American Astronomical Society, 2018, 156 (1), pp.art. 16. ⟨10.3847/1538-3881/aac432⟩ |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Brightness, 010504 meteorology & atmospheric sciences, Comet, FOS: Physical sciences, Coma (optics), Astrophysics, medicine.disease_cause, 01 natural sciences, Astronomi, astrofysik och kosmologi, 0103 physical sciences, Coronal mass ejection, medicine, Astronomy, Astrophysics and Cosmology, 010303 astronomy & astrophysics, Electron ionization, 0105 earth and related environmental sciences, Earth and Planetary Astrophysics (astro-ph.EP), Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Atomic emission spectroscopy, Astronomy and Astrophysics, individual (67P/C-G) [comets], coronal mass ejections (CMEs) [Sun], 13. Climate action, Space and Planetary Science, ALICE (propellant), planetary systems [ultraviolet], Ultraviolet, Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | The Alice ultraviolet spectrograph on the European Space Agency Rosetta spacecraft observed comet 67P/Churyumov-Gerasimenko in its orbit around the Sun for just over two years. Alice observations taken in 2015 October, two months after perihelion, show large increases in the comet's Ly-$\beta$, O I 1304, O I 1356, and C I 1657 $\AA$ atomic emission that initially appeared to indicate gaseous outbursts. However, the Rosetta Plasma Consortium instruments showed a coronal mass ejection (CME) impact at the comet coincident with the emission increases, suggesting that the CME impact may have been the cause of the increased emission. The presence of the semi-forbidden O I 1356 $\AA$ emission multiplet is indicative of a substantial increase in dissociative electron impact emission from the coma, suggesting a change in the electron population during the CME impact. The increase in dissociative electron impact could be a result of the interaction between the CME and the coma of 67P or an outburst coincident with the arrival of the CME. The observed dissociative electron impact emission during this period is used to characterize the O2 content of the coma at two peaks during the CME arrival. The mechanism that could cause the relationship between the CME and UV emission brightness is not well constrained, but we present several hypotheses to explain the correlation. Comment: 11 pages, 7 figures, 3 tables |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0004-6256 1538-3881 |
| DOI: | 10.3847/1538-3881/aac432⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2977d5b800c681ebde8bed64286b70a http://arxiv.org/abs/1806.06948 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....a2977d5b800c681ebde8bed64286b70a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00046256 15383881 |
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| DOI: | 10.3847/1538-3881/aac432⟩ |