The Dependence of the Cerean Exosphere on Solar Energetic Particle Events
Observations from Earth-based ground and orbiting telescopes indicate that the Ceres's exosphere has a time-varying water component. Evidence of a transient atmosphere was also detected by Dawn upon its arrival, inferred from the response on the Gamma Ray and Neutron Detector. That atmosphere a...
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| Veröffentlicht in: | Astrophysical journal. Letters 2017-03, Vol.838 (1), p.L8-L8 |
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| creator | Villarreal, M. N. Russell, C. T. Luhmann, J. G. Thompson, W. T. Prettyman, T. H. A'Hearn, M. F. Küppers, M. O'Rourke, L. Raymond, C. A. |
| description | Observations from Earth-based ground and orbiting telescopes indicate that the Ceres's exosphere has a time-varying water component. Evidence of a transient atmosphere was also detected by Dawn upon its arrival, inferred from the response on the Gamma Ray and Neutron Detector. That atmosphere appeared shortly after the passage of a large enhancement in the local flux of high-energy solar protons. Solar proton events have highly variable fluxes over a range of proton energies from 10 s of keV to over 100 MeV and are capable of sputtering water ice at or near the surface. Herein, we examine the fluxes of solar energetic protons measured during Earth-based attempts to detect water vapor and OH in the Ceres' atmosphere. We find that the presence of the cerean exosphere is correlated with the inferred presence of solar energetic protons at Ceres, consistent with the event detected by Dawn. |
| doi_str_mv | 10.3847/2041-8213/aa66cd |
| format | Article |
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N. ; Russell, C. T. ; Luhmann, J. G. ; Thompson, W. T. ; Prettyman, T. H. ; A'Hearn, M. F. ; Küppers, M. ; O'Rourke, L. ; Raymond, C. A.</creator><creatorcontrib>Villarreal, M. N. ; Russell, C. T. ; Luhmann, J. G. ; Thompson, W. T. ; Prettyman, T. H. ; A'Hearn, M. F. ; Küppers, M. ; O'Rourke, L. ; Raymond, C. A.</creatorcontrib><description>Observations from Earth-based ground and orbiting telescopes indicate that the Ceres's exosphere has a time-varying water component. Evidence of a transient atmosphere was also detected by Dawn upon its arrival, inferred from the response on the Gamma Ray and Neutron Detector. That atmosphere appeared shortly after the passage of a large enhancement in the local flux of high-energy solar protons. Solar proton events have highly variable fluxes over a range of proton energies from 10 s of keV to over 100 MeV and are capable of sputtering water ice at or near the surface. Herein, we examine the fluxes of solar energetic protons measured during Earth-based attempts to detect water vapor and OH in the Ceres' atmosphere. 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| subjects | ASTEROIDS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Atmospheres EMISSION Energetic particles EXOSPHERE Fluxes GAMMA RADIATION Ground-based observation ICE KEV RANGE MEV RANGE minor planets, asteroids: individual (Ceres) NEUTRON DETECTORS Neutron flux PLANETS planets and satellites: atmospheres Proton energy SATELLITE ATMOSPHERES SATELLITES SOLAR PROTONS Space telescopes SUN Sun: particle emission SURFACES TELESCOPES WATER |
| title | The Dependence of the Cerean Exosphere on Solar Energetic Particle Events |
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