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  • GEOPHYSICS  (147)
  • FLUID MECHANICS AND HEAT TRANSFER
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE
  • 1985-1989
  • 1980-1984  (218)
  • 1981  (218)
Collection
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  • 1985-1989
  • 1980-1984  (218)
Year
  • 1
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    The CAMEO barium release - E/parallel/ fields over the polar cap (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Four successive thermite barium releases at an altitude of 965 km over polar cap invariant latitudes 84 to 76 deg near magnetic midnight were conducted from the orbiting second stage of the vehicle that launched Nimbus 7; the releases were made as part of the CAMEO (Chemically Active Material Ejected in Orbit) program. This was the first opportunity to observe the behavior of conventional barium release when conducted at orbital velocity in the near-earth magnetic field. The principal unexpected characteristic in the release dynamics was the high, 1.4 to 2.6 km/s, initial Ba(+) expansion velocity relative to an expected velocity of 0.9 km/s. Attention is also given to neutral cloud expansion, initial ion cloud expansion, convective motion, and the characteristics of field-aligned motion. The possibility of measuring parallel electric fields over the polar cap by observing perturbations in the motion of the visible ions is assessed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    AFGL trace gas compilation - 1980 version (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new edition of the AFGL trace gas compilation is now available. Absorption line parameters of positions, intensities, and half-widths are given for the major bands of thirteen gases covering the spectral region from 0 to 10,000/cm. In addition to updating the original gases (NO, SO2, NO2, and NH3), the molecules HNO3, OH, HF, HCl, HBr, HI, ClO, OCS, and H2CO have been added to the compilation. The sources for the additions and modifications are described.
    Keywords: GEOPHYSICS
    Type: AD-A100357 , AFGL-TR-81-0159 , Applied Optics; 20; Apr. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Field-aligned currents in the earth's magnetotail (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Direct measurements of the plasma velocity distributions and simultaneous observations of magnetic fields are used to examine the character of field-aligned currents in the earth's magnetotail during the recovery phase of a magnetic substorm. Three contiguous field-aligned current sheets are identified at the interface between the magnetotail lobe and plasma sheet. Average current densities within these three current sheets are, in order of decreasing distance to the plasma sheet, +3.3 x 10 to the -9th, -1.3 x 10 to the -8th, and +1.1 x 10 to the -8th A/sq m, respectively.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; Feb. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The validation of LIMS ozone profiles using correlative rocket, ECC, and Dobson data sets (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Limb Infrared Monitor of the Stratosphere (LIMS) experiment is a limb scanning infrared sounder designed to measure vertical temperature profiles and the concentrations of key chemical compounds which are important in the stratospheric ozone-nitrogen photochemistry. Preliminary ozone profiles are being intercompared with correlative rocket and balloonsonde ozone data sets as part of the Nimbus 7 LIMS data validation activity. The LIMS ozone retrievals extend from the lower mesosphere to the tropopause (or cloud-top altitudes). In this paper, preliminary statistics of comparisons of ECC (electrochemical concentration cell) ozonesonde and rocket ozone profiles with LIMS ozone profiles are presented. ECC ozonesonde data taken at times of LIMS overpasses are also used to extend the LIMS retrieval down to ground level. Each combined profile is then integrated to obtain total column ozone. These integrated results are compared to Dobson data obtained at approximately the same time and location.
    Keywords: GEOPHYSICS
    Type: In: Quadrennial International Ozone Symposium; Aug 04, 1980 - Aug 09, 1980; Boulder, CO
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  • 5
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    Rapid inversion of limb radiance data using an emissivity growth approximation (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The time-consuming nature of limb relaxation-type inversion algorithms is due primarily to the numerous integrations over an absorption band to obtain forward radiance values with which to compare measured values. A new method has been devised for the quick and accurate (0.5% error) calculation of single gas broadband (approximately 100 per cm) limb radiance. The method uses a precalculated data base consisting of homogeneous path emissivity vs mass path data for a wide range of temperature and pressure. A 50-km altitude range, 1-km resolution, constituent inversion employing this method requires under 1 sec of computational time when run on modern computer hardware. The method does not rely upon a priori statistical knowledge.
    Keywords: GEOPHYSICS
    Type: Applied Optics; 20; Mar. 1
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  • 6
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    Polarization characteristics of hydromagnetic waves at low geomagnetic latitudes (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A field campaign, using three magnetometer stations spaced in latitude around the equatorial magnetic field distance L approximately 1.9, was conducted in early 1979 to investigate the polarization characteristics of hydromagnetic waves at low geomagnetic latitudes. The magnetic pulsations are observed to have periods in the range approximately 20-25 s and to occur primarily in the local morning hours. Statistically, the polarizations at all three stations were predominantly left handed in the local morning hours and right handed in the local afternoon. At the highest-latitude station (L approximately 2) the orientation of the major axis of the polarization ellipse changed from a predominantly NW-SE direction in the local morning to a mixed NW-SE/NE-SW direction in the afternoon. These two statistical results are consistent with the excitation of the waves by the Kelvin-Helmholtz instability at the magnetopause. However, frequent changes in phase are often observed in the magnetic variations, which result in polarization variations on the time scale of minutes, a situation not readily reconcilable with the Kelvin-Helmholtz instability. The existence of the waves at very low latitudes, furthermore, places constraints on the damping rate of externally excited surface waves inside the magnetosphere. We conclude that present theories for hydromagnetic waves in the geomagnetosphere cannot readily incorporate all of these low-latitude results.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; July 1
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    NASA TECHNICAL REPORTS
  • 7
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    Detailed aeromagnetic investigation of the Arctic Basin. II (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Remote sensing techniques must be employed to determine the nature of the regional geologic and tectonic structure of the Arctic Basin. Magnetic measurements from aircraft are the most commonly used method. Since 1972 the U.S. Navy has been engaged in a long-term program of mapping, in relative detail, the earth's magnetic field over that portion of the Arctic Basin accessible to the P3 aircraft. A description is presented of the results of the 1977 and 1978 field efforts. The description represents a continuation of an investigation reported by Vogt et al. (1979). The efforts currently considered were directed towards understanding the nature, age, and origin of the major physiolographic features of the western Arctic Basin. Particular attention was given to the Canada and Makarov basins (Fletcher Abyssal Plain) and the Alpha Ridge. The aeromagnetic data are interpreted with respect to the theory of origin presented by Carey (1958).
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; July 10
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  • 8
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    Satellite observations of upper atmosphere O3 and HNO3 from the Limb Infrared Monitor of the Stratosphere /LIMS/ experiment on Nimbus 7 (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The Limb Infrared Monitor of the Stratosphere (LIMS) experiment, launched on-board the Nimbus satellite, was designed to measure both day and night limb radiance which is used to infer upper atmosphere temperature profiles and chemical compound concentrations important in the study of ozone chemistry. The LIMS instrument is a six channel, limb scanning, thermal radiometer which uses HgCdTe detectors, cooled to approximately 64 K. Measurements include ozone, water vapor, nitrogen dioxide, and nitric acid. The ozone and nitric acid channels are centered at approximately 9.6 microns and 11.3 microns, respectively. Results from the channels are described with an emphasis on data validation. The O3 and HNO3 channels have demonstrated high measurement precision.
    Keywords: GEOPHYSICS
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    NASA TECHNICAL REPORTS
  • 9
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    A simple atmospheric model on the sphere with 100% parallelism (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A simple shallow water equations model used to test numerical weather prediction schemes is presented. The spherical geometry is transformed into a formally doubly periodic configuration which can be implemented on a massively parallel computer at 100% parallelism. A nonstaggered grid with all variables defined at the grid points (circles) is used. The parallel structure was simulated by performing step 1 in a FORTRAN array, on an Amdahl serial machine, changing the signs of the winds on the dark side.
    Keywords: GEOPHYSICS
    Type: Modeling and Simulation Facility: Res. Rev., 1980 - 1981; p 89-95
    Format: text
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  • 10
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    On the effect of high latitude filtering in global grid point models (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The application of various Fourier filtering techniques in a coarse resolution grid point model and the poor simulation of the nonlinear effects responsible for change in the mean zonal flow is discussed. The poor simulation results in spurious energy and momentum transfers. An operational filter, a second order filter on a staggered grid, a fourth order filter on a nonstaggered grid, and a biharmonic diffusion filter were considered.
    Keywords: GEOPHYSICS
    Type: Modeling and Simulation Facility: Res. Rev., 1980 - 1981; p 96-104
    Format: text
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