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By Space Studies Board Ad Hoc Committee on the Assessment of Mission Size Trade-Offs for Earth and Spac

Document addresses primary problems with challenge structure within the nation's medical area application and responds to the FY99 Senate convention document which asked that NASA fee a research to evaluate the strengths and weaknesses of small, medium, and massive missions. Softcover.

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2The tables in Appendix E list nonexhaustive examples of missions in the discipline areas and include the mission parameters or top-level scientific objectives for the mission, the relative size range (according to NASA definitions), the mission status of the program, and the timescale of the observations or measurements to be taken. 31 Copyright © National Academy of Sciences. All rights reserved. html 32 ASSESSMENT OF MISSION SIZE TRADE-OFFS FOR EARTH AND SPACE SCIENCE MISSIONS Chapter 2 is organized into two parts.

TERRIERS—Boston University’s Tomographic Experiment using Radiative Recombinative Ionospheric EUV and Radio Sources (TERRIERS) attempted to utilize space- and ground-based instruments to make daily global upper atmospheric measurements. Using tomography to measure ultraviolet light emissions, TERRIERS was to survey the upper atmosphere and utilize the technique to study ionospheric/thermospheric processes. Unfortunately, TERRIERS failed (see “Problems with Past Missions”); however, it nonetheless contributed significantly to education.

Html ISSUES AND CONSIDERATIONS IN THE ASSESSMENT OF MISSION SIZE TRADE-OFFS 21 Space Agency (ESA). Smaller missions are generally chosen through open announcements of opportunity (AOs)41 in which numerous missions are considered but only a few are actually selected for flight. , less than 4 months), a preexisting relationship with one’s collaborators is generally required. 42 The AO process for small missions may have an impact on international cooperation for some missions owing to the disciplinary breadth of the announcements, which results in a large number of proposals being submitted.

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