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  • ASTRONOMY  (9)
  • SPACE SCIENCES  (5)
  • SPACECRAFT INSTRUMENTATION  (3)
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  • 1
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    Helium-like line emission from coronal features (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Solar corona O VII and Ne IX helium line triplets observations, examining electron density limits
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Large-aperture high-resolution X-ray collimator for the Solar Maximum Mission (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A description is presented of a flight-qualified large-aperture 12 x 12-arcsec angular resolution multigrid X-ray collimator developed for the Solar Maximum Mission (SMM) flat crystal spectrometer. This collimator, designed for the 1.4-22.4-A wavelength range, utilizes an optical bench/metering structure to align and support prealigned grid subassemblies. The optical bench is a lightweight, rigid, and stable aluminum honeycomb structure. The grids are of a compound and bimetallic design, having 63.5-micron square holes on an 88.9-micron spacing in 8-micron thick gold, which is in turn supported by a 76-micron thick Invar grid having 600-micron square holes on a 739-micron spacing. The small apertures in the gold provide the 12-arcsec collimation with the Invar grids providing wide angle off-axis blocking out to an approximately 35 arcmin view angle. The collimator has seven individual channels, four of a 5.1- x 10-cm area and three of a 1.3- x 10-cm area. Laboratory measurements gave an average angular resolution of 12.5 arcsec FWHM with 0.259 transmission for the large-area channels and 12.0 arcsec and 0.200 transmission for the small-area channels. A thermal filter composed of two layers of approximately 1000-A thick aluminum prevents solar heating of the front collimator grids by absorbing longer wavelength radiation while passing most of the X radiation in the band of interest.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics; 19; Sept. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The extended X-ray source in Virgo and its relation to M87 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Spectral data in the 0.2-1.6 keV range are presented for the extended X-ray source in the Virgo cluster. When combined with Uhuru data, the simplest function which fits the composite spectrum from 0.2 to 10 keV is one describing bremsstrahlung from an isothermal plasma at 36 million deg K. Production of the X-rays by inverse compton scattering is also considered, and models relating the X-ray source to M87 are discussed.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 190; June 15
    Format: text
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  • 4
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    Mapping X-ray heliometer for Orbiting Solar Observatory-8 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An instrument combining mechanical collimators and proportional counter detectors was designed to record solar X-rays with energies of 2-30 keV with good temperal, spectral, and spatial resolution. The overall operation of the instrument is described to the degree needed by personnel who interact with the experimenter during SC/experiment interfacing, experiment testing, observatory integration and testing, and pre/post launch data processing. The general layout of the instrument is given along with a summary of the instrument characteristics.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: NASA-CR-144710
    Format: application/pdf
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  • 5
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    The soft X-ray polychromator for the Solar Maximum Mission (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper considers the soft X-ray polychromator (XRP) operating in the 1.4-22.4 A range of the soft X-ray spectrum which includes many emission lines important for the diagnosis of plasmas in the 1.5-50 million deg temperature range. The flat crystal scanning spectrometer provides for a channel polychromatic mapping of flares and active regions in the resonance lines of O VIII, Ne IX, and Mg XI; in its spectral scanning mode it covers essentially the entire 1.4-22.5 A region.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Solar Physics; 65; Feb. 198
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  • 6
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    Observation of soft X-rays from extended sources (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Efforts were directed toward surveying several supernova remnants for the emission of soft X-rays. Rather than attempt to detect such faint X-ray emission, the program was redirected to observe the spectrum and angular structure of the extended X-ray source in the Perseus cluster of galaxies and the super-nova remnant Puppis A. An attempt was made to detect X-ray line emission from Puppis A with a Bragg crystal spectrometer. Observations provide evidence for the presence of X-ray line emission in the spectrum of Puppis A near .65 keV.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-140516
    Format: application/pdf
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  • 7
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    X-ray structure of the Puppis supernova remnant (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The angular distribution of X-ray emission from the Puppis supernova remnant was investigated with a focusing X-ray collector during a rocket observation. Extent of the X-ray emitting region along the direction of scan is 42 (+ or - 4) arcmin and is well correlated with the size of the Puppis A radioshell. The existence of a feature within the remnant is confirmed whose X-ray emission is strongly localized, and its spectrum is observed to be softer than the rest of the remnant.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 207; Aug. 1
    Format: text
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  • 8
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    Rocket studies of X-rays from the nonflaring sun Final report (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Rocket measurements on high energy tail of quiescent solar X ray spectrum
    Keywords: SPACE SCIENCES
    Type: NASA-CR-106267 , LSMC-N-A3-69-1
    Format: application/pdf
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  • 9
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    Paraboloidal X-ray telescope mirror for solar coronal spectroscopy (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The telescope mirror for the X-ray Spectrograph Spectrometer Telescope System is a sixty degree sector of an extreme off-axis paraboloid of revolution. It was designed to focus a coronal region 1 by 10 arc seconds in size on the entrance slit of the spectrometer after reflection from the gold surface. This paper discusses the design, manufacture, and metrology of the mirror, the methods of precision mechanical metrology used to focus the system, and the mounting system which locates the mirror and has proven itself through vibration tests. In addition, the results of reflection efficiency measurements, alignment tolerances, and ray trace analysis of the effects of misalignment are considered.
    Keywords: ASTRONOMY
    Type: Space optics: Imaging X-ray optics workshop; May 22, 1979 - May 24, 1979; Huntsville, AL
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  • 10
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    X-ray spectrometer spectrograph telescope system (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new sounding rocket payload that has been developed for X-ray spectroscopic studies of the solar corona is described. The instrument incorporates a grazing incidence Rowland mounted grating spectrograph and an extreme off-axis paraboloic sector feed system to isolate regions of the sun of order 1 x 10 arc seconds in size. The focal surface of the spectrograph is shared by photographic and photoelectric detection systems, with the latter serving as a part of the rocket pointing system control loop. Fabrication and alignment of the optical system is based on high precision machining and mechanical metrology techniques. The spectrograph has a resolution of 16 milliangstroms and modifications planned for future flights will improve the resolution to 5 milliangstroms, permitting line widths to be measured.
    Keywords: ASTRONOMY
    Type: Space optics: Imaging X-ray optics workshop; May 22, 1979 - May 24, 1979; Huntsville, AL
    Format: text
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