Author: Dwain F. Spencer
Publisher:
ISBN:
Category : Engineering models
Languages : en
Pages : 23

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Book Description

Author: George M. Levin
Publisher:
ISBN:
Category : Mars (Planet)
Languages : en
Pages : 64

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Book Description

Author: Harry Edward Bailey
Publisher:
ISBN:
Category : Mars (Planet)
Languages : en
Pages : 180

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Book Description

Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722163754
Category :
Languages : en
Pages : 30

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Book Description
An engineering model atmosphere for Mars is being developed with many of the same features and capabilities for the highly successful Global Reference Atmospheric Model (GRAM) program for Earth's atmosphere. As an initial approach, the model is being built around the Martian atmosphere model computer subroutine (ATMOS) of Culp and Stewart (1984). In a longer-term program of research, additional refinements and modifications will be included. ATMOS includes parameterizations to stimulate the effects of solar activity, seasonal variation, diurnal variation magnitude, dust storm effects, and effects due to the orbital position of Mars. One of the current shortcomings of ATMOS is the neglect of surface variation effects. The longer-term period of research and model building is to address some of these problem areas and provide further improvements in the model (including improved representation of near-surface variations, improved latitude-longitude gradient representation, effects of the large annual variation in surface pressure because of differential condensation/sublimation of the CO2 atmosphere in the polar caps, and effects of Martian atmospheric wave perturbations on the magnitude of the expected density perturbation. Justus, C. G. Unspecified Center NAG8-78...

Author: Gerhard F. Schilling
Publisher:
ISBN:
Category : Mars (Planet)
Languages : en
Pages : 18

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Book Description
The planning of the exploration of Mars by means of space vehicles imposes demands on our knowledge of the atmosphere of Mars which go beyond the concepts of 'best values' or 'most likely conditions.' In view of the present scarcity of reliable data, a theoretical model of the Martian atmosphere is offered here which instead gives the limiting conditions to be encountered. This model atmosphere gives extreme upper and lower probable limits of pressure, temperature, and density up to 150 km altitude over middle and low latitudes, independent of time of day or season. In addition, a number of parameters are tabulated which are of concern for the engineering design of entry probes. The mathematical method was based on the present factual knowledge with a minimum of assumptions and has therefore yielded results on a rather high confidence level. This has been achieved in part through an extremely wide spread of values. Nevertheless, a combination of circumstances makes it apparent that the engineering task of atmospheric entry will be easier for the Martian atmosphere than for the atmosphere of any other planet in our solar system. It can safely be concluded that Mars will be the first planet inviting manned exploration from an engineering as well as scientific point of view. (Author).

Author: National Research Council
Publisher: National Academies Press
ISBN: 0309169593
Category : Science
Languages : en
Pages : 65

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Book Description
This study, commissioned by the National Aeronautics and Space Administration (NASA), examines the role of robotic exploration missions in assessing the risks to the first human missions to Mars. Only those hazards arising from exposure to environmental, chemical, and biological agents on the planet are assessed. To ensure that it was including all previously identified hazards in its study, the Committee on Precursor Measurements Necessary to Support Human Operations on the Surface of Mars referred to the most recent report from NASA's Mars Exploration Program/ Payload Analysis Group (MEPAG) (Greeley, 2001). The committee concluded that the requirements identified in the present NRC report are indeed the only ones essential for NASA to pursue in order to mitigate potential hazards to the first human missions to Mars.

Author: Robert M. Haberle
Publisher: Cambridge University Press
ISBN: 110817938X
Category : Science
Languages : en
Pages : 613

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Book Description
Humanity has long been fascinated by the planet Mars. Was its climate ever conducive to life? What is the atmosphere like today and why did it change so dramatically over time? Eleven spacecraft have successfully flown to Mars since the Viking mission of the 1970s and early 1980s. These orbiters, landers and rovers have generated vast amounts of data that now span a Martian decade (roughly eighteen years). This new volume brings together the many new ideas about the atmosphere and climate system that have emerged, including the complex interplay of the volatile and dust cycles, the atmosphere-surface interactions that connect them over time, and the diversity of the planet's environment and its complex history. Including tutorials and explanations of complicated ideas, students, researchers and non-specialists alike are able to use this resource to gain a thorough and up-to-date understanding of this most Earth-like of planetary neighbours.

Author: Harry Edward Bailey
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 0

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Book Description

Author: Harry Edward Bailey
Publisher:
ISBN:
Category :
Languages : en
Pages : 162

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Book Description

Author: Goddard Space Flight Center
Publisher:
ISBN:
Category : Mars (Planet)
Languages : en
Pages : 92

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Book Description
Data derived from Mariners 6, 7, and 9, Russian Mars probes, and photographic and radar observations conducted from Earth are used to develop engineering models of Martian surface properties. These models are used in mission planning and in the design of landing and exploration vehicles. Optical models needed in the design of camera systems, dielectric properties needed in the design of radar systems, and thermal properties needed in the design of the spacecraft thermal control system are included.