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  • 1
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    Planetary astronomy (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Comets were studied during their relatively quiescent phases at large distances from the sun. This program, has resulted in a variety of CCD images of comets in several visible and near-IR bands selected to sample the continuum, rather than emission features. The most extensive dataset was obtained for P/Halley during January 1985 (plus scattered earlier data), near the time the comet turned on. The data were reduced in a preliminary fashion. Other comets predicted to be relatively inactive (including Neujmin 1 and Arend-Rigaux) were most active than expected. P/Gehrels 3 was also observed.
    Keywords: ASTRONOMY
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 82-84
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Soft X-ray astronomy using grazing incidence optics (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The instrumental background of X-ray astronomy with an emphasis on high resolution imagery is outlined. Optical and system performance, in terms of resolution, are compared and methods for improving the latter in finite length instruments described. The method of analysis of broadband images to obtain diagnostic information is described and is applied to the analysis of coronal structures.
    Keywords: ASTRONOMY
    Type: Symposium of High Energy Solar Physics; Tokyo; Japan|Solar X-ray Astronomy Sounding Rocket Program; 4 p
    Format: application/pdf
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  • 3
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    Velocity-resolved observations of water in Comet Halley (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: High resolution (lambda/delta lambda approx. = 3 x 10 to the 5th power) near-infrared observations of H2O emission from Comet Halley were acquired at the time of maximum post-perihelion geocentric Doppler shift. The observed widths and absolute positions of the H2O line profiles reveal characteristics of the molecular velocity field in the coma. These results support H2O outflow from a Sun-lit hemisphere or the entire nucleus, but not from a single, narrow jet emanating from the nucleus. The measured pre- and post-perihelion outflow velocities were 0.9 + or - 0.2 and 1.4 + or - 0.2 km/s, respectively. Temporal variations in the kinematic properties of the outflow were inferred from changes in the spectral line shapes. These results are consistent with the release of H2O into the coma from multiple jets.
    Keywords: ASTRONOMY
    Type: NASA-TM-88367 , PREPRINT-58 , A-86410 , NAS 1.15:88367
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The measured performance of a grazing incidence relay optics telescope for solar X-ray astronomy (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The design, fabrication, and test performance of a grazing-incidence diverging magnifier (GIDM) for use in high-resolution X-ray imaging of the solar corona are described. The GIDM, designed to be mounted in front of the focus of a 30.48-cm Wolter-Schwarzschild primary, is an Ni-coated Be hyperboloid-hyperboloid structure of principal diameter 3.15 cm; the two components are mounted on a central steel plate which acts as a support and spacer. The combined instrument has overall length 1.9 m, effective focal length 5.4 m, and plate scale 26.0 micron/arcsec. In point- and line-source measurements in an 89.5-m vacuum test facility, the on-axis resolution is shown to be equal to that of the primary alone. The field of view for 1-arcsec resolution is limited to 1.25 arcmin in radius, but the effective-area limitation is less significant when CCD detectors of high quantum efficiency are used instead of film.
    Keywords: ASTRONOMY
    Type: X-ray imaging II; Aug. 20, 21, 1986; San Diego, CA; United States
    Format: text
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  • 5
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    Advances in photographic X-ray imaging for solar astronomy (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The technique of obtaining quantitative data from high resolution soft X-ray photographic images produced by grazing incidence optics was successfully developed to a high degree during the Solar Research Sounding Rocket Program and the S-054 X-Ray Spectrographic Telescope Experiment Program on Skylab. Continued use of soft X-ray photographic imaging in sounding rocket flights of the High Resolution Solar Soft X-Ray Imaging Payload has provided opportunities to further develop these techniques. The developments discussed include: (1) The calibration and use of an inexpensive, commercially available microprocessor controlled drum type film processor for photometric film development; (2) The use of Kodak Technical Pan 2415 film and Kodak SO-253 High Speed Holographic film for improved resolution; and (3) The application of a technique described by Cook, Ewing, and Sutton for determining the film characteristics curves from density histograms of the flight film. Although the superior sensitivity, noise level, and linearity of microchannel plate and CCD detectors attracts the development efforts of many groups working in soft X-ray imaging, the high spatial resolution and dynamic range as well as the reliability and ease of application of photographic media assures the continued use of these techniques in solar X-ray astronomy observations.
    Keywords: ASTRONOMY
    Type: American Science and Engineering, Inc., Solar X-ray Astronomy Sounding Rocket Program; 14 p
    Format: application/pdf
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