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pro vyhledávání: '"Johnson, R E"'
Molecular kinetic simulations are typically used to accurately describe the tenuous regions of the upper atmospheres on planetary bodies. These simulations track the motion of particles representing real atmospheric atoms and/or molecules subject to
Externí odkaz:
http://arxiv.org/abs/2107.12343
The Martian upper atmosphere is known to vary diurnally and seasonally due to changing amounts of solar radiation. However, in the upper thermosphere and exosphere, the neutrals are also subject to ion precipitation. This can increase the temperature
Externí odkaz:
http://arxiv.org/abs/1812.11434
Autor:
Desai, R. T., Taylor, S. A., Regoli, L. H., Coates, A. J., Nordheim, T. A., Cordiner, M. A., Teolis, B. D., Thomsen, M. F., Johnson, R. E., Jones, G. H., Cowee, M. M., Waite, J. H.
Saturn's largest icy moon, Rhea, hosts a tenuous surface-sputtered exosphere composed primarily of molecular oxygen and carbon dioxide. In this Letter, we examine Cassini Plasma Spectrometer velocity space distributions near Rhea and confirm that Cas
Externí odkaz:
http://arxiv.org/abs/1711.11256
Autor:
Melin, H., Fletcher, L. N., Stallard, T. S., Johnson, R. E., O'Donoghue, J., Moore, L., Donnelly, P. T.
Emission from the molecular ion H$_3^+$ is a powerful diagnostic of the upper atmosphere of Jupiter, Saturn, and Uranus, but it remains undetected at Neptune. In search of this emission, we present near-infrared spectral observations of Neptune betwe
Externí odkaz:
http://arxiv.org/abs/1711.08978
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Observations indicate that some of the largest Kuiper Belt Objects (KBOs) have retained volatiles in the gas phase, which implies the presence of an atmosphere that can affect their reflectance spectra and thermal balance. Volatile escape rates drive
Externí odkaz:
http://arxiv.org/abs/1503.05315
The Voyager flyby observations revealed that a very broad doughnut shaped distribution of the hydrogen atoms existed in the Saturnian magnetosphere. Recent Cassini observations confirmed the local-time asymmetry but also showed the hydrogen cloud den
Externí odkaz:
http://arxiv.org/abs/1302.3270
The detection of O2+ and O+ ions over Saturn's main rings by the Cassini INMS and CAPS instruments at Saturn orbit insertion (SOI) in 2004 confirmed the existence of the ring atmosphere and ionosphere. The source mechanism was suggested to be primari
Externí odkaz:
http://arxiv.org/abs/1112.5511
A combined fluid/kinetic model is developed to calculate thermally driven escape of N2 from Pluto's atmosphere for two solar heating conditions: no heating above 1450 km and solar minimum heating conditions. In the combined model, one-dimensional flu
Externí odkaz:
http://arxiv.org/abs/1111.2808
Autor:
Johnson, R. E.
Accurately determining escape rates from a planet's atmosphere is critical for determining its evolution. Escape can be driven by upward thermal conduction of energy deposited well below the exobase, as well as by non-thermal processes produced by en
Externí odkaz:
http://arxiv.org/abs/1001.0917