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Far-ultraviolet aur...
Far-ultraviolet aurora identified at comet 67P/Churyumov-Gerasimenko
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- Galand, M. (author)
- Imperial Coll London, Dept Phys, London, England.
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- Feldman, P. D. (author)
- Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
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- Bockelee-Morvan, D. (author)
- Univ Paris, Sorbonne Univ, Univ PSL, CNRS,Observ Paris,LESIA, Meudon, France.
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- Biver, N. (author)
- Univ Paris, Sorbonne Univ, Univ PSL, CNRS,Observ Paris,LESIA, Meudon, France.
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Cheng, Y. -C (author)
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- Rinaldi, G. (author)
- INAF, IAPS, Rome, Italy.
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- Rubin, M. (author)
- Univ Bern, Phys Inst, Bern, Switzerland.
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- Altwegg, K. (author)
- Univ Bern, Phys Inst, Bern, Switzerland.
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- Deca, J. (author)
- Univ Colorado, Lab Atmospher & Space Phys LASP, Boulder, CO 80309 USA.;NASA, Inst Modeling Plasma Atmospheres & Cosm Dust, SSERVI, Moffett Field, CA USA.
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- Beth, A. (author)
- Imperial Coll London, Dept Phys, London, England.
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- Stephenson, P. (author)
- Imperial Coll London, Dept Phys, London, England.
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- Heritier, K. L. (author)
- Imperial Coll London, Dept Phys, London, England.
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- Henri, P. (author)
- Univ Orleans, CNRS, LPC2E, Orleans, France.
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- Parker, J. Wm. (author)
- Southwest Res Inst, Dept Space Studies, Boulder, CO USA.
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- Carr, C. (author)
- Imperial Coll London, Dept Phys, London, England.
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- Eriksson, Anders (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Burch, J. (author)
- Southwest Res Inst, San Antonio, TX USA.
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Imperial Coll London, Dept Phys, London, England Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. (creator_code:org_t)
- 2020-09-21
- 2020
- English.
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In: Nature Astronomy. - : NATURE RESEARCH. - 2397-3366. ; 4:11, s. 1084-1091
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Abstract
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- In situ measurements from the Rosetta spacecraft reveal the presence of atomic emissions close to comet 67P's nucleus. Such emissions are due to dissociative excitation of molecules by the interaction with the solar wind, identifying them as a form of aurora. Having a nucleus darker than charcoal, comets are usually detected from Earth through the emissions from their coma. The coma is an envelope of gas that forms through the sublimation of ices from the nucleus as the comet gets closer to the Sun. In the far-ultraviolet portion of the spectrum, observations of comae have revealed the presence of atomic hydrogen and oxygen emissions. When observed over large spatial scales as seen from Earth, such emissions are dominated by resonance fluorescence pumped by solar radiation. Here, we analyse atomic emissions acquired close to the cometary nucleus by the Rosetta spacecraft and reveal their auroral nature. To identify their origin, we undertake a quantitative multi-instrument analysis of these emissions by combining coincident neutral gas, electron and far-ultraviolet observations. We establish that the atomic emissions detected from Rosetta around comet 67P/Churyumov-Gerasimenko at large heliocentric distances result from the dissociative excitation of cometary molecules by accelerated solar-wind electrons (and not by electrons produced from photo-ionization of cometary molecules). Like the discrete aurorae at Earth and Mars, this cometary aurora is driven by the interaction of the solar wind with the local environment. We also highlight how the oxygen line Oiat wavelength 1,356 A could be used as a tracer of solar-wind electron variability.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- ref (subject category)
- art (subject category)
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- By the author/editor
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Galand, M.
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Feldman, P. D.
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Bockelee-Morvan, ...
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Biver, N.
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Cheng, Y. -C
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Rinaldi, G.
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show more...
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Rubin, M.
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Altwegg, K.
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Deca, J.
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Beth, A.
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Stephenson, P.
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Heritier, K. L.
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Henri, P.
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Parker, J. Wm.
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Carr, C.
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Eriksson, Anders
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Burch, J.
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show less...
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Nature Astronomy
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Uppsala University