scholarly journals Brief Communication: Residence Time of Energy in the Atmospheres of Venus, Earth, Mars and Titan

2021 ◽  
Author(s):  
Javier Pelegrina ◽  
Carlos Osácar ◽  
Amalio Fernández-Pacheco
Keyword(s):  
Lower Bounds ◽  
Residence Time ◽  
Time Scale ◽  
Planetary Atmosphere ◽  
Residence Times ◽  
Thermal Perturbation ◽  
Return To Equilibrium ◽  
Energy Data ◽  
Earth’S Atmosphere ◽  
Earth's Atmosphere

Abstract. The concept of residence time of energy in a planetary atmosphere τR, recently introduced and computed for the Earth's atmosphere (Osácar et al., 2020), is here extended to the atmospheres of Venus, Mars and Titan. After a global thermal perturbation, τR is the time scale the atmosphere needs to return to equilibrium. The residence times of energy in the atmospheres of Venus, Earth, Mars and Titan have been computed. In the cases of Venus, Mars and Titan, these are mere lower bounds due to a lack of some energy data.

scholarly journals Brief communication: Lower-bound estimates for residence time of energy in the atmospheres of Venus, Mars and Titan

2021 ◽  
Vol 28 (4) ◽  
pp. 627-631
Author(s):  
Javier Pelegrina ◽  
Carlos Osácar ◽  
Amalio Fernández-Pacheco
Keyword(s):  
Lower Bound ◽  
Lower Bounds ◽  
Residence Time ◽  
Energy Transport ◽  
Planetary Atmosphere ◽  
Thermal Perturbation ◽  
Return To Equilibrium ◽  
Energy Data ◽  
Earth’S Atmosphere ◽  
Earth's Atmosphere

Abstract. The residence time of energy in a planetary atmosphere, τ, which was recently introduced and computed for the Earth's atmosphere (Osácar et al., 2020), is here extended to the atmospheres of Venus, Mars and Titan. τ is the timescale for the energy transport across the atmosphere. In the cases of Venus, Mars and Titan, these computations are lower bounds due to a lack of some energy data. If the analogy between τ and the solar Kelvin–Helmholtz scale is assumed, then τ would also be the time the atmosphere needs to return to equilibrium after a global thermal perturbation.

The Problem of Kinetic Heating Associated with Unmanned Re-entry Vehicles

1962 ◽  
Vol 66 (624) ◽  
pp. 764-766
Author(s):  
A. J. Craig
Keyword(s):  
Dynamic Stability ◽  
Planetary Atmosphere ◽  
List Type ◽  
Mechanical Shock ◽  
Art And Science ◽  
Earth’S Atmosphere ◽  
Earth's Atmosphere

The art and science of re-entering a vehicle into a planetary atmosphere poses many problems, which are today on the edge of man’s mental and industrial capabilities. Re-entering a vehicle into the earth’s atmosphere incurs the following major problems: —(a) Kinetic heating as it passes through the denser regions of the atmosphere. Materials have to be found which can deal with the enormous amounts of heating experienced by the vehicle.(b) Design of a vehicle to withstand large thermal and mechanical shock.(c) Dynamic stability at hypersonic velocities.(d) Accuracy of direction of entry into the atmosphere.(e) Recovery of the capsule after impact, wherever it landed.This paper deals with the kinetic heating aspect of re-entry and shows how present day materials are utilised in restricting the inside temperature of re-entry vehicles to within reasonable limits. Unmanned re-entry is specified because to re-enter a manned capsule puts large restrictions on deceleration and inside temperature limits and hence produces some unique problems which are not covered in this paper.

History of the Earth’s Atmosphere

1987 ◽  
Author(s):  
Michael I. Budyko ◽  
Alexander B. Ronov ◽  
Alexander L. Yanshin
Keyword(s):  
Earth’S Atmosphere ◽  
History Of ◽  
Earth's Atmosphere

THE ENERGIES AND MOLECULAR PARAMETERS INVOLVED IN THE REACTION OF CH + 1,3-BUTADIENE

2020 ◽  
Author(s):  
A. NIKOLAYEV ◽  
◽  
A. M. Mebel ◽  
V. N. Azyazov ◽  
◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Combustion Products ◽  
Fuel Combustion ◽  
Molecular Parameters ◽  
Earth’S Atmosphere ◽  
Earth's Atmosphere ◽  
Reduce Emissions

This research is devoted to the problem of environmental pollution. The study of various pathways that reduce emissions of fuel combustion products into the Earth's atmosphere is still applicable today.

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