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Electron accelerati...
Electron acceleration at comet 67P/Churyumov-Gerasimenko
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- Goldstein, R. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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- Burch, J. L. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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- Llera, K. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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- Mokashi, P. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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- Nilsson, H. (author)
- Swedish Inst Space Phys, Kiruna, Sweden.
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- Dokgo, K. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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- Eriksson, Anders (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Odelstad, Elias (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Richter, I (author)
- Tech Univ Carolo Wilhelmina Braunschweig, Braunschweig, Germany.
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Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA Swedish Inst Space Phys, Kiruna, Sweden. (creator_code:org_t)
- 2019-09-20
- 2019
- English.
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In: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 630
- Related links:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- We report the observation by the Ion and Electron Sensor (IES) of energetic (>1 keV) electrons in the plasma environment of comet 67P Churyumov-Gerasimenko (67P). Most of the electrons in the cometary coma are expected to be of solar wind, photoionization, or electron impact origin and are therefore not expected to exceed some hundreds of eV in energy. During the Vega flybys of comet Halley, 1 keV electrons were also observed, and these are explained as having been accelerated by lower hybrid (LH) waves resulting from the two-stream instability involving the solar wind and pickup-ion flows. These waves resonate with the cyclotron motion of the ions and the longitudinal motion of electrons and are on the order of several Hz, at least in the case of 67P. We postulate that the energetic electrons we have observed intermittently during December 2015 through January 2016 are also the result of such a process and that Landau damping causes the acceleration and subsequent abrupt decrease in this energy (also seen at Halley). We show from this study an event on 19 January 2016 when IES simultaneously observed accelerated electrons, solar wind protons, water ions, and LH waves. A dispersion analysis shows that the ion-ion two-stream instability has positive growth rates for such waves during the observation period.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- plasmas
- waves
- methods: data analysis
- comets: individual: 67P/Churyumov-Gerasimenko
Publication and Content Type
- ref (subject category)
- art (subject category)
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