Strong HI Lyman-$\alpha$ variations from the 11 Gyr-old host star Kepler-444: a planetary origin ?
, 2017 Kepler-444 provides a unique opportunity to probe the atmospheric composition and evolution of a compact system of exoplanets smaller than the Earth. Five planets transit this bright K star at close orbital distances, but they are too small for their ...
Allart, R. +10 more
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Charge exchange lifetimes for ions in the magnetosphere [PDF]
Latest and best measurements of physical quantities involved in complete calculation of the charge exchange lifetime of mirroring magnetospheric ions are coalesced and summarized.
Bewtra, N. K., Smith, P. H.
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X-ray Observation of Mars with Suzaku at Solar Minimun
, 2011 Mars was observed in X-rays during April 3-5 2008 for 82 ksec with the Japanese Suzaku observatory. Mars has been known to emit X-rays via the scattering of solar X-rays and via the charge exchange between neutral atoms in the exosphere and solar wind ...
Ezoe, Yuichiro +4 more
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Seasonal Water "Pump" in the Atmosphere of Mars: Vertical Transport to the Thermosphere
, 2019 We present results of simulations with the Max Planck Institute general circulation model (MPI-MGCM) implementing a hydrological cycle scheme. The simulations reveal a seasonal water "pump" mechanism responsible for the upward transport of water vapor ...
Hartogh, Paul +3 more
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A very high frequency radio interferometer for investigating ionospheric disturbances using geostationary satellites. Determination of changes in exospheric electron content by a comparison of group delay and Faraday rotation [PDF]
The theory and development of a VHF correlation radio interferometer for investigating ionospheric disturbances are discussed. The system was developed to receive signals from the geostationary Applications Technology Satellites.
Dubroff, R. E. +2 more
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Quantum-limited measurements of optical signals from a geostationary satellite
, 2017 The measurement of quantum signals that traveled through long distances is of fundamental and technological interest. We present quantum-limited coherent measurements of optical signals, sent from a satellite in geostationary Earth orbit to an optical ...
Bayraktar, Ömer +15 more
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Quasi-exospheric heat flux of solar-wind electrons [PDF]
Density, bulk-velocity, and heat-flow moments are calculated for truncated Maxwellian distributions representing the cool and hot populations of solar-wind electrons, as realized at the base of a hypothetical exosphere.
Eviatar, A., Schultz, M.
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Lunar base activities and the lunar environment [PDF]
The Moon is an attractive site for astronomical observatories and other facilities because of the absence of a substantial lunar atmosphere and the stability of the lunar surface.
Vondrak, Richard R.
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A New Mechanism for Early-Time Plasmaspheric Refilling: The Role of Charge Exchange Reactions in the Transport of Energy and Mass Throughout the Ring Current-Plasmasphere System. [PDF]
J Geophys Res Space Phys, 2022 Liu J, Ilie R, Borovsky JE, Liemohn MW.
europepmc +1 more source
Evaporation of extrasolar planets
, 2008 Atomic hydrogen escaping from the extrasolar giant planet HD209458b provides the largest observational signature ever detected for an extrasolar planet atmosphere. In fact, the upper atmosphere of this planet is evaporating.
Ehrenreich, David
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