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  • 1
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    An Overview of Electrodynamic Tether Performance in the Jovian System (1998)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Jovian magnetosphere with its strong magnetic field and the rapid rotation of the planet present new opportunities and challenges for the use of electrodynamic tethers. An overview of the basic plasma physics properties of an electrodynamic tether moving through the Jovian magnetosphere is examined. Tether use for both propulsion and power generation are considered. Close to the planet, tether propulsive forces are found to be as high as 50 Newtons and power levels as high as 1 million Watts.
    Keywords: Spacecraft Design, Testing and Performance
    Type: Tether Technology Interchange Meeting; 335-344; NASA/CP-1998-206900
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Interstellar Exploration: Propulsion Options for Precursors and Beyond (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: NASA is considering missions to explore new-interstellar space (40-250 Astronomical Units) early in the next decade as the first step toward a vigorous interstellar exploration program.
    Keywords: Spacecraft Propulsion and Power
    Type: International Astronautical Federation (IAF) Congress; Amsterdam; Netherlands
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Tether-Based Investigation of the Ionosphere and Lower Thermosphere Concept Definition Study Report (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Understanding the plasma and atmosphere around the Earth in the lower altitude regions of the mesosphere, lower thermosphere, and ionosphere is important in the global electric system. An upper atmosphere tether has been proposed to NASA that would collect much-needed data to further our knowledge of the regions. The mission is proposed as a shuttle experiment that would lower a tethered probe into certain regions of Earth's atmosphere, collecting data over a 6-day period. This report is a summary of the results of a concept definition study to design engineering system that will achieve the scientific objectives of this mission.
    Keywords: Geophysics
    Type: NASA-TM-108543 , NAS 1.15:108543
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The Magnetosphere Imager Mission Concept Definition Study (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: For three decades, magnetospheric field and plasma measurements have been made by diverse instruments flown on spacecraft in many different orbits, widely separated in space and time, and under various solar and magnetospheric conditions. Scientists have used this information to piece together an intricate, yet incomplete view of the magnetosphere. A simultaneous global view, using various light wavelengths and energetic neutral atoms, could reveal exciting new data and help explain complex magnetospheric processes, thus providing us with a clear picture of this region of space. The George C. Marshall Space Flight Center (MSFC) is responsible for defining the Magnetosphere Imager mission which will study this region of space. A core instrument complement of three imagers (with the potential addition of one or more mission enhancing instrument) will fly in an elliptical polar Earth orbit with an apogee of 44,600 kilometers and a perigee of 4,800 km. This report will address the mission objectives, spacecraft design concepts, and the results of the MSFC concept definition study.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-RP-1401 , NAS 1.61:1401 , M-832
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Analysis of Forest Foliage Using a Multivariate Mixture Model (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Data with wet chemical measurements and near infrared spectra of ground leaf samples were analyzed to test a multivariate regression technique for estimating component spectra which is based on a linear mixture model for absorbance. The resulting unmixed spectra for carbohydrates, lignin, and protein resemble the spectra of extracted plant starches, cellulose, lignin, and protein. The unmixed protein spectrum has prominent absorption spectra at wavelengths which have been associated with nitrogen bonds.
    Keywords: Inorganic, Organic and Physical Chemistry
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Electrodynamic Tether Propulsion and Power Generation at Jupiter (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The results of a study performed to evaluate the feasibility and merits of using an electrodynamic tether for propulsion and power generation for a spacecraft in the Jovian system are presented. The environment of the Jovian system has properties which are particularly favorable for utilization of an electrodynamic tether. Specifically, the planet has a strong magnetic field and the mass of the planet dictates high orbital velocities which, when combined with the planet's rapid rotation rate, can produce very large relative velocities between the magnetic field and the spacecraft. In a circular orbit close to the planet, tether propulsive forces are found to be as high as 50 N and power levels as high as 1 MW.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA/TP-1998-208475 , NAS 1.60:208475 , M-876
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    International Space Station Electrodynamic Tether Reboost Study (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The International Space Station (ISS) will require periodic reboost due to atmospheric aerodynamic drag. This is nominally achieved through the use of thruster firings by the attached Progress M spacecraft. Many Progress flights to the ISS are required annually. Electrodynamic tethers provide an attractive alternative in that they can provide periodic reboost or continuous drag cancellation using no consumables, propellant, nor conventional propulsion elements. The system could also serve as an emergency backup reboost system used only in the event resupply and reboost are delayed for some reason.
    Keywords: Astronautics (General)
    Type: NASA/TM-1998-208538 , M-886 , NAS 1.15:208538
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Probability Density Functions of Observed Rainfall in Montana (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The question of whether a rain rate probability density function (PDF) can vary uniformly between precipitation events is examined. Image analysis on large samples of radar echoes is possible because of advances in technology. The data provided by such an analysis easily allow development of radar reflectivity factors (and by extension rain rate) distribution. Finding a PDF becomes a matter of finding a function that describes the curve approximating the resulting distributions. Ideally, one PDF would exist for all cases; or many PDF's that have the same functional form with only systematic variations in parameters (such as size or shape) exist. Satisfying either of theses cases will, validate the theoretical basis of the Area Time Integral (ATI). Using the method of moments and Elderton's curve selection criteria, the Pearson Type 1 equation was identified as a potential fit for 89 percent of the observed distributions. Further analysis indicates that the Type 1 curve does approximate the shape of the distributions but quantitatively does not produce a great fit. Using the method of moments and Elderton's curve selection criteria, the Pearson Type 1 equation was identified as a potential fit for 89% of the observed distributions. Further analysis indicates that the Type 1 curve does approximate the shape of the distributions but quantitatively does not produce a great fit.
    Keywords: Meteorology and Climatology
    Type: NASA-CR-202491 , NAS 1.26:202491 , 27th Conference on Radar Meteorology; 394-396|Radar Meteorology; Oct 09, 1995 - Oct 13, 1995; Vail, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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