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  • 1
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    Centaurus A, the core of the problem (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The bright, peculiar elliptical galaxy Centaurus A (NGC 5128, PKS 1322-427) was one of the first extragalactic radio sources to be optically identified (Bolton et al. 1949). At a distance of 4 Mpc, Centaurus A is the closest active radio galaxy and affords the highest linear imaging resolution (1 mas approximately equal to 0.02 pc) and hence the best prospects for studying an active nucleus close to the central radio source. We present the results of multi-epoch, 8.4-GHz, very long baseline interferometry (VLBI), imaging observations of the nucleus made over the past three years. The nucleus possesses a core-jet structure where the inner portion of the jet shows apparent linear motion with a velocity substantially less than the speed of light.
    Keywords: ASTRONOMY
    Type: Australian Journal of Physics (ISSN 0004-9506); 47; 5; p. 619-624
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  • 2
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    Interannual variability study of the earth radiation budget from Nimbus 7 monthly data (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The broadband data set on the earth radiation budget recorded by Nimbus-7 instrumentation from 1978-84 is summarized, along with the results of several statistical evaluations. The emitted longwave radiation (W/sq m), albedo and net radiation (W/sq m) are tabulated in terms of yearly means and summer and winter departures from those means. Global maps are also provided for 6-yr averaged values of the same parameters. The largest variabilities were observed over the equatorial Pacific Ocean, the Indian Ocean, and Indonesia, indicating the extent of annual variations of the size of the Intertropical Convergence Zone.
    Keywords: GEOPHYSICS
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  • 3
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    Geologic and mineral and water resources investigations in western Colorado using ERTS-1 data (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Topography was found to be the most important factor defining folds on ERTS-1 imagery of northwestern Colorado; tonal variations caused by rock reflectance and vegetation type and density are the next most important factors. Photo-linears mapped on ERTS-1 imagery of central Colorado correlate well with ground-measured joint and fracture trends. In addition, photo-linears have been successfully used to determine the location and distribution of metallic mineral deposits in the Colorado Mineral Belt. True color composites are best for general geologic analysis and false color composites prepared with positive/negative masks are useful for enhancing local geologic phenomena. During geologic analysis of any given area, ERTS-1 imagery from several different dates should be studied.
    Keywords: GEOPHYSICS
    Type: E74-10330 , NASA-CR-136825 , REPT-73-5 , PR-9
    Format: application/pdf
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  • 4
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    The southern hemisphere VLBI experiment (SHEVE) (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Six radio telescopes were operated as the first southern hemisphere VLBI array in April and May 1982. Observations were made at 2.3 and 8.4 Ghz. This array produced VLBI images of 28 southern hemisphere radio sources, high accuracy VLBI geodesy between southern hemisphere sites, and sub-arcsecond radio astrometry of celestial sources south of declination -45 degrees. This paper discusses only the astrophysical aspects of the experiment.
    Keywords: ASTRONOMY
    Type: IAU Symposium on the Impace of VLBI on Astrophysics and Geophysics; May 10, 1987 - May 15, 1987; Cambridge, MA; United States
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  • 5
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    Preliminary results from the Sprites94 aircraft campaign: 1. Red sprites (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The dual jet aircraft Sprites94 campaign yielded the first color imagery and unambiguously triangulated physical dimensions and heights of upper atmospheric optical emissions associated with thunderstorm systems. Low light level television images, in both color and in black and white (B/W), obtained during the campaign show that there are at least two distinctively different types of optical emissions spanning part or all of the distance between the anvil tops and the ionosphere. The first of these emissions, dubbed 'sprites' after their elusive nature, are luminous structures of brief (less than 16 ms) duration with a red main body that typically spans the latitude range 50-90 km, and possessing lateral dimensions of 5-30 km. Faint bluish tendrils often extend downward from the main body of sprites, occasionally appearing to reach cloud tops near 20 km. In this paper the principal characteristics of red sprites as observed during the Sprites94 campaign are described. The second distinctive type of emissions, 'blue jets,' are described in a companion paper (Wescott et al., this issue).
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 22; 10; p. 1205-1208
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  • 6
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    Radio observations of SN 1987A (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The study of radio emission from SN 1987A after the neutrino burst is reviewed. The observed maximum flux density of the burst at radio wavelengths was about 140 mJy and occurred at 1.4 GHz. The radio light curves for SN 1987A at four frequencies are compared with data for SN 1979C and SN 1980K. VLBI observations of SN 1987A at 2.3 GHz and other radio monitoring programs are examined.
    Keywords: ASTRONOMY
    Type: Geroge Mason Astrophysics Workshop; Oct 12, 1987 - Oct 14, 1987; Fairfax, VA; United States
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  • 7
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    The total hemispherical emittance of platinum, columbium-1 percent zirconium, and polished and oxidized inor-8 in the range 100 deg to 1200 deg c (1963)
    In:  CASI
    Details
    Publication Date: 2009-12-28
    Description: Temperature dependence of hemispherical emittance of metal and alloy strips in 100- to 1200-deg c range using blackbody vacuum chamber
    Keywords: GEOPHYSICS
    Type: Measurement of Thermal Radiation Properties of Solids; NASA-SP-31
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  • 8
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    Spectral emittance measurements from 40 deg c to 200 deg c (1963)
    In:  CASI
    Details
    Publication Date: 2009-12-28
    Description: Spectral emittance of opaque and transparent materials from 40- to 200-deg c
    Keywords: GEOPHYSICS
    Type: Measurement of Thermal Radiation Properties of Solids; NASA-SP-31
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  • 9
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    The unusual morphology of molecular hydrogen emission in the planetary nebula J900 (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We report new high-resolution near-infrared imaging observations of the planetary nebula J900, in broadband J, H, and K, and narrowband 2.122 micrometers (for H2 1-0 S(1)), Brackett-gamma, and continuum filters. The H2 images reveal a remarkable set of outward-extending features not detected in any previous observations of theis object. In the northwest lobe of the inner bipolar region, the H2 emission, Brackett-gamma emission, and underlying continuum are spatially resolved. The relative positions of the peaks of the line emission suggest an ionization front seen edge-on. The continuum emission, apparently located nearer to the central star, is likely due to transiently heated small dust grains. The extended H2 emission features are probably excited either by oblique shocks caused by material ejected from the nebula, or by radiation leaking from holes in the opacity surrounding the ionized shell.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 109; 3; p. 1173-1180
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  • 10
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    Relativistic electron fluxes in May 1992 and their effect on the middle atmosphere (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Enhancements in the fluxes of relativistic electrons trapped within the Earth's magnetosphere have been measured by the high-energy particle spectrometer, part of the particle environment monitor on the upper atmosphere research satellite (UARS). The largest increase in the electron fluxes with energies greater than 1 MeV observed on UARS from October 1991 through July 1994 was in early May 1992. The fluxes of trapped electrons in the drift loss cone and locally precipitating electrons showed differing buildup and decay rates as a function of invariant latitude. Increases of more than 2 orders of magnitude were observed in drift loss cone fluxes at magnetic latitudes of 40 deg-66 deg and in precipitating fluxes from 48 deg to 66 deg. The energy flux contained in the most intense local precipitation observed was approximately 0.1 erg/sq cm/s, entering the atmosphere and creating up to 1000 ion pairs/cu cm/s at 55-km altitude. The daily averaged energy flux from directly precipitating electrons with energies greater than 1 MeV deposited greater than 10(exp 20) erg/d worldwide into the atmosphere for the period May 12-21, 1992, producing greater than 10(exp 31) odd nitrogen molecules below 60-km altitude.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; D1; p. 1027-1033
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