The DOI matches its Crossref record; 58 of the 61 references it cites were found in a registry or an index.
Hydrodynamic planetary thermosphere model: 1. Response of the Earth's thermosphere to extreme solar EUV conditions and the significance of adiabatic cooling
Abstract
It has been suggested that the exobase temperature of early terrestrial planetary atmosphere could have reached over 10,000 K. Although such high exobase temperatures should have caused the major gases at the exobase to experience fast Jeans escape, and the entire thermosphere should have experienced hydrodynamic flow, hydrostatic equilibrium was assumed to be valid in this earlier model. In this paper we develop a multicomponent hydrodynamic thermosphere model to self‐consistently study the Earth's thermosphere under extreme solar EUV conditions. The model is validated against observations and other models for the present Earth's thermosphere. Simulations show that if forced in hydrostatic equilibrium and maintaining the current composition, the Earth's thermosphere could experience a fast transition to an atmospheric blowoff state when exposed to solar EUV radiation stronger than certain critical flux. When hydrodynamic flow and its associated adiabatic cooling are included, atmospheric blowoff is prevented and Earth's exobase temperature decreases with increasing solar EUV beyond the critical solar EUV flux. Simulations show that the transition of the thermosphere from the hydrostatic equilibrium regime to the hydrodynamic regime occurs when the exobase temperature reaches 7000 to 8000 K if atomic O and N dominate the upper thermosphere. The fast variations of the bulk motion velocities under different exobase temperatures suggest that the adiabatic cooling effect could have kept the exobase temperature lower than ∼1000 K if light gases such as atomic hydrogen were the dominant species in the Earth's thermosphere. We propose that hydrodynamic flow and associated adiabatic cooling should exist in the thermospheres of a broad range of early and/or close‐in terrestrial type planets and that the adiabatic cooling effect must be included in the energy balance in order to correctly estimate their thermospheric structures and their evolutionary paths.
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“At higher levels of solar XUV radiation, the Earth's atmosphere is hotter and more expanded (Tian et al. 2008; Tian et al. 2009; Kuramoto et al. 2013), leading to more rapid losses to space (Lammer et al. 2008; Lichtenegger et al. 2010; Lammer et al. 2018).”
From The young Sun's XUV-activity as a constraint for lower CO2-limits in the Earth's Archean atmosphere (2021) · cites this paper as Tian et al. 2008
In the citing paper
“For high XUV fluxes the thermosphere can be heated to high temperatures and the upper atmosphere starts to expand very efficiently so that losses at the exobase cause a large scale outward flow of material, and the resulting adiabatic cooling to some extent counters the strong heating (Tian et al. 2005; Tian et al. 2008; Murray-Clay et al. 2009).”
From The young Sun's XUV-activity as a constraint for lower CO2-limits in the Earth's Archean atmosphere (2021) · cites this paper as Tian et al. 2008
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Metadata
- Authors
- Tian, F., Kasting, J. F., Liu, H., & Roble, R. G.
- Affiliations
- NSF National Center for Atmospheric Research (US)
- Pennsylvania State University (US)
- High Altitude Observatory National Center for Atmospheric Research Boulder Colorado USA
- Venue
- Journal of Geophysical Research: Planets
- Publisher
- American Geophysical Union (AGU)
- Published
- 2008-05
- Volume
- 113
- Issue
- E5
- ISSN
- 0148-0227 (ISSN-L)
- OpenAlex
- W2067818744
- Cited by
- 153
- References
- 61
- Citations by year
- 2026: 8 · 2025: 4 · 2024: 5 · 2023: 8 · 2022: 11 · 2021: 2 · 2020: 16 · 2019: 5 · 2018: 4 · 2017: 7 · 2016: 8 · 2015: 12 · 2014: 11 · 2013: 14 · 2012: 7
- FWCI
- 5.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Geophysical Research Atmospheres (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Ionosphere and magnetosphere dynamics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
- Keywords
- adiabatic cooling, solar EUV radiation, hydrostatic equilibrium, Jeans escape, close-in exoplanets, atomic hydrogen
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