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  • Other Sources  (44)
  • 2005-2009
  • 1995-1999
  • 1980-1984  (44)
  • 1984  (44)
  • 1
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    The Anza array: a high-dynamic-range, broadband, digitally radiotelemetered seismic array (1984)
    In:  Bull. Seism. Soc. Am., San Francisco, Pergamon, vol. 74, no. 6, pp. 1469-1481, pp. 1246
    Details
    Publication Date: 1984
    Keywords: Seismic networks ; Seismic arrays ; Detectors ; sta ; Broad-band ; Tele-communication ; Seismology ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    The adaptation of vestibulo-spinal reflexes as a function of spaceflight and their relationship to space motion sickness (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The hypothesis that exposure to prolonged free fall is a form of sensorymotor rearrangement rather than a direct change in otolith sensitivity or sensory compensation for a reduced otolith input is discussed. Data from Spacelab-1 experiment 1NS-104 are presented to support an otolith reinterpretation hypothesis. This experiment measured vestibulo-spinal reflex changes as a function of sustained free fall. Findings indicate that when a monosynaptic reflex (H-reflex), measured from the major postural muscles (soleus) is used, adaptation to space flight includes a change in how the central nervous system interprets a fall. In a normal gravity environment a sudden unexpected fall produces a potentiated H-reflex. After 7 days inflight, an equivalent fall does not potentiate the reflex. Postflight a greatly increased reflex is observed in those crewmen most susceptible to space motion sickness.
    Keywords: AEROSPACE MEDICINE
    Type: ESA Life Sci. Res. in Space; p 237-245
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Fluvial erosion of impact craters: Earth and Mars (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-06
    Description: Geomorphic studies of impact structures in central Australia are being used to understand the complexities of fluvial dissection in the heavily cratered terrains of Mars. At Henbury, Northern Territory, approximately 12 small meteorite craters have interacted with a semiarid drainage system. The detailed mapping of the geologic and structural features at Henbury allowed this study to concentrate on degradational landforms. The breaching of crater rims by gullies was facilitated by the northward movement of sheetwash along an extensive pediment surface extending from the Bacon Range. South-facing crater rims have been preferentially breached because gullies on those sides were able to tap the largest amounts of runoff. At crater 6 a probable rim-gully system has captured the headward reaches of a pre-impact stream channel. The interactive history of impacts and drainage development is critical to understanding the relationships in the heavily cratered uplands of Mars. Whereas Henbury craters are younger than 4700 yrs. B.P., the Gosses Bluff structure formed about 130 million years ago. The bluff is essentially an etched central peak composed of resistant sandstone units. Fluvial erosion of this structure is also discussed.
    Keywords: GEOPHYSICS
    Type: NASA. Washington Rept. of Planetary Geol. Programs; p 175-177
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Research on aviation fuel instability (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-09
    Description: The problems associated with aircraft fuel instability are discussed. What is currently known about the problem is reviewed and a research program to identify those areas where more research is needed is discussed. The term fuel instability generally refers to the gums, sediments, or deposits which can form as a result of a set of complex chemical reactions when a fuel is stored for a long period at ambient conditions or when the fuel is thermally stressed inside the fuel system of an aircraft.
    Keywords: PROPELLANTS AND FUELS
    Type: Assessment of Alternative Aircraft Fuels; p 121-130
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    NASA TECHNICAL REPORTS
  • 5
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    Substorm associated traveling compression regions in the distant tail - ISEE-3 geotail observations (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: While in the lobes of the distant magnetotail, ISEE-3 encountered regions of compressed magnetic field at a rate of several per day. The duration of these events was 5 to 20 minutes and they were observed 10 to 30 minutes following the onset of substorm activity near the earth. During each event, the lobe magnetic field tilted first northward and then southward with the inflection point near the time of peak field strength. Following the compression events, the lobe field weakened and retained a southward component for 20 to 40 minutes. It is suggested that these traveling compression regions are the lobe signatures of plasmoids moving rapidly down the tail in the plasma sheet. Comparison of ISEE-3 compression event times with substorm onset times yielded propagation speeds of 350 to 750 km/s.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 657-660
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    NASA TECHNICAL REPORTS
  • 6
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    Structure of the magnetotail at 220 earth radii and its response to geomagnetic activity (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Using plasma electron and magnetic field measurements from ISEE 3, 220 earth radii from earth, it is found that the magnetotail at that distance is a coherent structure that evidently waves about through distances comparable to its own lateral scale size. For about one-third of the time it was inside the magnetotail, ISEE 3 was in the plasma sheet. During quiet times the plasma sheet is apparently quite thin, but in response to geomagnetic activity it expands, becoming filled with hot plasma flowing tailward at speeds sometimes exceeding 1000 km/sec, and forces the magnetotail cross-section itself to expand. The plasma sheet's expansion is delayed typically by about 30 minutes from the onset of the associated geomagnetic activity (often a clearly identified isolated substorm). The magnetic field in the newly-expanded plasma sheet usually exhibits a few-minute steep northward excursion followed by a more prolonged (and often steep) southward excursion. These are believed to be the signatures of arrival of a plasmoid formed and released near the earth at the onset of the corresponding geomagnetic activity. The discreteness of these plasma releases through the magnetotail and their close association with onsets of geomagnetic activity at earth suggest that they are consequences of spontaneous release, probably by magnetic reconnection, of energy and plasma earlier stored in the magnetotail.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 5-7
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    NASA TECHNICAL REPORTS
  • 7
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    Plasma entry into the distant tail lobes - ISEE-3 (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: ISEE-3 measurements indicate that a broad mantle-like boundary layer plasma often exists within the distant geomagnetic tail lobes at all latitudes, directly adjacent to the tail magnetopause. The presence of this boundary layer at large tail distances indicates that plasma from the magnetosheath often crosses the magnetopause locally along much of the length of the tail, and is evidence that the tail is 'open'.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 1078-108
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The impact of scatterometer wind data on global weather forecasting (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The impact of SEASAT-A scatterometer (SASS) winds on coarse resolution atmospheric model forecasts was assessed. The scatterometer provides high resolution winds, but each wind can have up to four possible directions. One wind direction is correct; the remainder are ambiguous or "aliases'. In general, the effect of objectively dealiased-SASS data was found to be negligible in the Northern Hemisphere. In the Southern Hemisphere, the impact was larger and primarily beneficial when vertical temperature profile radiometer (VTPR) data was excluded. However, the inclusion of VTPR data eliminates the positive impact, indicating some redundancy between the two data sets.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Marshall Space Flight Center Frontiers of Remote Sensing of the Oceans and Troposphere from Air and Space Platforms; p 567-573
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Comparison of Forecast and Observed Energetics (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: An energetics analysis scheme was developed to compare the observed kinetic energy balance over North America with that derived from forecast fields of the GLAS fourth order model for the 13 to 15 January 1979 cyclone case. It is found that: (1) the observed and predicted kinetic energy and eddy conversion are in good qualitative agreement, although the model eddy conversion tends to be 2 to 3 times stronger than the observed values. The eddy conversion which is stronger in the 12 h forecast than in observations and may be due to several factors is studied; (2) vertical profiles of kinetic energy generation and dissipation exhibit lower and upper tropospheric maxima in both the forecast and observations; (3) a lag in the observational analysis with the maximum in the observed kinetic energy occurring at 0000 GMT 14 January over the same region as the maximum ddy conversion 12 h earlier is noted.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Global Scale Atmospheric Processes Res. Program Review; p 122-125
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    NASA TECHNICAL REPORTS
  • 10
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    Comparison of Optimum Interpolation and Cressman Analyses (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: The objective of this investigation is to develop a state-of-the-art optimum interpolation (O/I) objective analysis procedure for use in numerical weather prediction studies. A three-dimensional multivariate O/I analysis scheme has been developed. Some characteristics of the GLAS O/I compared with those of the NMC and ECMWF systems are summarized. Some recent enhancements of the GLAS scheme include a univariate analysis of water vapor mixing ratio, a geographically dependent model prediction error correlation function and a multivariate oceanic surface analysis.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Global Scale Atmospheric Processes Res. Program Review; p 39-41
    Format: text
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