Satellite Density Measurements with the Rotatable Calibration Accelerometer (ROCA)

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ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Satellite Density Measurements with the Rotatable Calibration Accelerometer (ROCA) by : Frank A. Marcos

Download or read book Satellite Density Measurements with the Rotatable Calibration Accelerometer (ROCA) written by Frank A. Marcos and published by . This book was released on 1979 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite accelerometer measurements of atmospheric density have provided significant improvement in our understanding of the structure and dynamics of the lower thermosphere. Derivation of accurate data with this technique requires removal of instrument bias from the total sensor output. The ROCA (Rotatable Calibration Accelerometer) experiment was flown to provide and orbital calibration capability on the three-axis stabilized S3-4 satellite. The ROCA sensitive axis could be operated in either of two orientations selectable by ground command. For density measurement (normal operating mode) the sensitive axis was aligned with the satellite velocity vector. For direct measurement of bias, the sensitive axis was aligned perpendicular to the velocity vector. Utilization of the inflight calibration technique showed a dependence of the bias upon the instrument operating temperature. Removal of the bias-temperature component from the total acceleration signal obtained in the normal operating mode permits derivation of accurate density data. Measurements of atmospheric density were obtained during approximately 600 orbits over a five month period. The resulting ROCA data will be utilized for improved satellite ephemeris computations and for detailed studies of the lower thermosphere, particularly those related to energy inputs at high latitudes. (Author).

Satellite Density Measurements with the Rotatable Calibration Accelerometer (ROCA)

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Satellite Density Measurements with the Rotatable Calibration Accelerometer (ROCA) by : Frank A. Marcos

Download or read book Satellite Density Measurements with the Rotatable Calibration Accelerometer (ROCA) written by Frank A. Marcos and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite accelerometer measurements of atmospheric density have provided significant improvement in our understanding of the structure and dynamics of the lower thermosphere. Derivation of accurate data with this technique requires removal of instrument bias from the total sensor output. The ROCA (Rotatable Calibration Accelerometer) experiment was flown to provide and orbital calibration capability on the three-axis stabilized S3-4 satellite. The ROCA sensitive axis could be operated in either of two orientations selectable by ground command. For density measurement (normal operating mode) the sensitive axis was aligned with the satellite velocity vector. For direct measurement of bias, the sensitive axis was aligned perpendicular to the velocity vector. Utilization of the inflight calibration technique showed a dependence of the bias upon the instrument operating temperature. Removal of the bias-temperature component from the total acceleration signal obtained in the normal operating mode permits derivation of accurate density data. Measurements of atmospheric density were obtained during approximately 600 orbits over a five month period. The resulting ROCA data will be utilized for improved satellite ephemeris computations and for detailed studies of the lower thermosphere, particularly those related to energy inputs at high latitudes. (Author)

A Global Thermospheric Density Model Based on Satellite Accelerometer Data

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ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 ( download)

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Book Synopsis A Global Thermospheric Density Model Based on Satellite Accelerometer Data by : Frank A. Marcos

Download or read book A Global Thermospheric Density Model Based on Satellite Accelerometer Data written by Frank A. Marcos and published by . This book was released on 1982 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Application of the Satellite Triaxial Accelerometer Experiment to Atmospheric Density and Wind Studies

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ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Application of the Satellite Triaxial Accelerometer Experiment to Atmospheric Density and Wind Studies by : Frank A. Marcos

Download or read book Application of the Satellite Triaxial Accelerometer Experiment to Atmospheric Density and Wind Studies written by Frank A. Marcos and published by . This book was released on 1982 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new satellite triaxial accelerometer system has been developed. This instrument has been flight-tested on three-axis stabilized satellites and has demonstrated the capability to accurately measure accelerations in the satellite's in-track, cross-track, and radial directions. The in-track data provide direct determination of atmospheric density. These data, obtained during a period of high solar flux, supplement the extensive set of measurements obtained by other accelerometer experiments during low solar flux conditions. The cross-track and radial results permit, for the first time, large-scale measurements of the zonal and, possibly, radial components of neutral atmospheric winds. These simultaneous wind and density data provide an extremely valuable input for the understanding of dynamic processes in the atmosphere and for the improvement of atmospheric models.

Satellite Atmospheric Radiance Measurements in the Vacuum Ultraviolet

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Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Satellite Atmospheric Radiance Measurements in the Vacuum Ultraviolet by : Robert E. Huffman

Download or read book Satellite Atmospheric Radiance Measurements in the Vacuum Ultraviolet written by Robert E. Huffman and published by . This book was released on 1979 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A satellite experiment has obtained nadir-viewing atmospheric radiance measurements in the 1100 to 2900 angstrom wavelength region from the polar orbiting satellite S3-4. This report describes the instrumentation, measurement techniques, and initial results. The observed emission is from airglow, solar scatter, and auroral regions. Spectral and spatial measurements previously unavailable have been made for the nitrogen Lyman-Birge-Hopfield emission, vacuum ultraviolet aurora, hydrogen geocorona, tropical ultraviolet airglow, twilight fluorescence nitric oxide spectrum, and night oxygen Herzberg band emission. Low values of the day and night background radiance values have been found; these values can be applied to improved missile detection techniques. Spatial resolution down to about one kilometer will enable possible variability to be sought. Observations were made in the period March to September 1978. Correlations with other geophysical factors such as solar flux, magnetic index, and seasonal variations will be made after the data base from the experiment is completed.

Scientific and Technical Aerospace Reports

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Publisher :
ISBN 13 :
Total Pages : 760 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Instrumentation Papers

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ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.6/5 (248 download)

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Book Synopsis Instrumentation Papers by :

Download or read book Instrumentation Papers written by and published by . This book was released on 1978 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Government Reports Announcements & Index

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ISBN 13 :
Total Pages : 1182 pages
Book Rating : 4.3/5 (129 download)

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Book Synopsis Government Reports Announcements & Index by :

Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1979 with total page 1182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

R & D Abstracts

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ISBN 13 :
Total Pages : 554 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis R & D Abstracts by : Technology Reports Centre (Great Britain)

Download or read book R & D Abstracts written by Technology Reports Centre (Great Britain) and published by . This book was released on 1980 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Application of Satellite Accelerometer Data to Improve Density Models

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ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Application of Satellite Accelerometer Data to Improve Density Models by : Frank A. Marcos

Download or read book Application of Satellite Accelerometer Data to Improve Density Models written by Frank A. Marcos and published by . This book was released on 1984 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric density measurements obtained by the satellite accelerometer experiment provide data over a wide range of solar and geophysical conditions. These results are used in a preliminary evaluation of several atmospheric models. The model accuracies are compared by their mean values and standard deviations relative to the accelerometer data. Sources of model uncertainties and problems in reducing them are described. Long-term programs involving coordinated measurements, analyses of available data and theoretical studies are required along with development of more accurate indicators of solar and geomagnetic activity before models can show significant improvement. Keywords include: Satellite, Accelerometers, Atmospheric density measurements, Thermospheric model evaluations, Thermospheric density variability.

Meteorological and Geoastrophysical Abstracts

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ISBN 13 :
Total Pages : 1382 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Meteorological and Geoastrophysical Abstracts by :

Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1979 with total page 1382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Technical Abstract Bulletin

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ISBN 13 :
Total Pages : 368 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Technical Abstract Bulletin by :

Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1979 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Government Reports Annual Index

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ISBN 13 :
Total Pages : 1032 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Government Reports Annual Index by :

Download or read book Government Reports Annual Index written by and published by . This book was released on 1979 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Government Reports Annual Index: Keyword A-L

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ISBN 13 :
Total Pages : 840 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Government Reports Annual Index: Keyword A-L by :

Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1979 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Peacebuilding Tool for a Conflict-Sensitive Approach to Development

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Publisher : Asian Development Bank
ISBN 13 : 929092604X
Total Pages : 102 pages
Book Rating : 4.2/5 (99 download)

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Book Synopsis A Peacebuilding Tool for a Conflict-Sensitive Approach to Development by : Asian Development Bank

Download or read book A Peacebuilding Tool for a Conflict-Sensitive Approach to Development written by Asian Development Bank and published by Asian Development Bank. This book was released on 2012-03-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Asian Development Bank (ADB) works with a number of developing member countries facing fragile and conflict-affected situations---circumstances that complicate economic development, and might include domestic or international conflict, ethnic tensions, vulnerability to natural disasters, or a confluence of these factors. ADB piloted the peacebuilding tool in Nepal as a conflict-sensitive approach, a key to effective and safe implementation of projects in the country's post-conflict context. The peacebuilding tool is an analytical tool for assisting project team leaders and social experts in understanding the local context, and in identifying potential risks to implementation of development projects that are linked to social conflicts, as well as in formulating mitigation measures for addressing these risks.

Precise Geodetic Infrastructure

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Publisher : National Academies Press
ISBN 13 : 0309163293
Total Pages : 157 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Precise Geodetic Infrastructure by : National Research Council

Download or read book Precise Geodetic Infrastructure written by National Research Council and published by National Academies Press. This book was released on 2010-10-25 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geodesy is the science of accurately measuring and understanding three fundamental properties of Earth: its geometric shape, its orientation in space, and its gravity field, as well as the changes of these properties with time. Over the past half century, the United States, in cooperation with international partners, has led the development of geodetic techniques and instrumentation. Geodetic observing systems provide a significant benefit to society in a wide array of military, research, civil, and commercial areas, including sea level change monitoring, autonomous navigation, tighter low flying routes for strategic aircraft, precision agriculture, civil surveying, earthquake monitoring, forest structural mapping and biomass estimation, and improved floodplain mapping. Recognizing the growing reliance of a wide range of scientific and societal endeavors on infrastructure for precise geodesy, and recognizing geodetic infrastructure as a shared national resource, this book provides an independent assessment of the benefits provided by geodetic observations and networks, as well as a plan for the future development and support of the infrastructure needed to meet the demand for increasingly greater precision. Precise Geodetic Infrastructure makes a series of focused recommendations for upgrading and improving specific elements of the infrastructure, for enhancing the role of the United States in international geodetic services, for evaluating the requirements for a geodetic workforce for the coming decades, and for providing national coordination and advocacy for the various agencies and organizations that contribute to the geodetic infrastructure.

Textbook of Geodesy

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ISBN 13 :
Total Pages : 876 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Textbook of Geodesy by : Carl Fridolin Baeschlin

Download or read book Textbook of Geodesy written by Carl Fridolin Baeschlin and published by . This book was released on 1976 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt: