Recapturing a Future for Space Exploration


Book Description

More than four decades have passed since a human first set foot on the Moon. Great strides have been made in our understanding of what is required to support an enduring human presence in space, as evidenced by progressively more advanced orbiting human outposts, culminating in the current International Space Station (ISS). However, of the more than 500 humans who have so far ventured into space, most have gone only as far as near-Earth orbit, and none have traveled beyond the orbit of the Moon. Achieving humans' further progress into the solar system had proved far more difficult than imagined in the heady days of the Apollo missions, but the potential rewards remain substantial. During its more than 50-year history, NASA's success in human space exploration has depended on the agency's ability to effectively address a wide range of biomedical, engineering, physical science, and related obstacles-an achievement made possible by NASA's strong and productive commitments to life and physical sciences research for human space exploration, and by its use of human space exploration infrastructures for scientific discovery. The Committee for the Decadal Survey of Biological and Physical Sciences acknowledges the many achievements of NASA, which are all the more remarkable given budgetary challenges and changing directions within the agency. In the past decade, however, a consequence of those challenges has been a life and physical sciences research program that was dramatically reduced in both scale and scope, with the result that the agency is poorly positioned to take full advantage of the scientific opportunities offered by the now fully equipped and staffed ISS laboratory, or to effectively pursue the scientific research needed to support the development of advanced human exploration capabilities. Although its review has left it deeply concerned about the current state of NASA's life and physical sciences research, the Committee for the Decadal Survey on Biological and Physical Sciences in Space is nevertheless convinced that a focused science and engineering program can achieve successes that will bring the space community, the U.S. public, and policymakers to an understanding that we are ready for the next significant phase of human space exploration. The goal of this report is to lay out steps and develop a forward-looking portfolio of research that will provide the basis for recapturing the excitement and value of human spaceflight-thereby enabling the U.S. space program to deliver on new exploration initiatives that serve the nation, excite the public, and place the United States again at the forefront of space exploration for the global good.




Semiannual Report to the Congress


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Report to the Congress


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Reports and Documents


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Introduction to Solar-terrestrial Phenomena and the Space Environment Services Center


Book Description

This report is an introduction to solar-terrestrial phenomena for those with no special background in astrophysics or solar astronomy. Discussions of physics have been kept to a minimum, with emphasis on phenomonology instead. An individual completely unfamiliar with solar events should, after reading this volume, be able to read and understand the SESC Report and Forecast of Solar Geophysical Activity and be able to apply its contents to his particular area of concern. This volume is also intended as a quick reference work for Skylab ATM Principal Investigator Teams to assist them in using the ATM data book. For that reason, a list of abbreviations used in forecasts and observatory reports is included. Subjects discussed are solar structure and processes, solar activity, and solar-terrestrial relations. There is a brief description of the Space Environment Services Center's activities.




Calibration of X-ray Ion Chambers for the Space Environment Monitoring System


Book Description

Measurements of the steady-state of the ion-chamber current output to the incident energy flux of a monochromatic X-ray beam are reported for the 1/2-3 Å and 1-8 Å ion chambers for the NOAA Space Environment Monitoring System. Bragg crystal reflection was employed to obtain a monochromatic beam. Proportional counters were used to measure the absolute intensity of the monochromatic X-ray beam. An ultra-sensitive electrometer was used to measure the current output of the ion chamber, including currents as small as 10−15 amps with noise levels as low as about 10−16 amps. The calibration results are compared with the theoretical transfer function. The effects of anode structures on reducing the effective total area of the ion chambers were observed as a function of wavelength. The influence of small regions of epoxy overlying the window was examined.