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  • 1
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    Solar rotation measurements at Mount Wilson. I - Analysis and instrumental effects (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: We examine the background velocity fields of the sun as observed at Mount Wilson. The method of velocity reduction of the full-disk Mount Wilson data is outlined. We describe a number of tests that have been carried out in order to find an instrumental origin for short-term rotation variations and a large-scale background line-shift - the ears. No instrumental cause can be found for this ear effect, although such a cause cannot yet be ruled out.
    Keywords: ASTRONOMY
    Type: AD-A097176 , Solar Physics; 66; May 1980
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Recalibration of Mount Wilson Doppler measurements (Research note) (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The dispersion calibration of spectroscopic velocity measurements made with the 150-ft tower telescope at Mt. Wilson Observatory is revised upward by 0.55 percent on the basis of observations of the six lines of comparable shape and equivalent width nearest the 5250.2-A line of Fe-I used in the solar Doppler rate measurements. The dispersion results are presented in a graph, and the superiority of the Kitt Peak wavelength tables (Pierce and Breckenridge, 1973) over those of Moore et al. (1966) is demonstrated. As a result of the recalibration, all recent spectroscopic velocities from this telescope must be revised downward by 0.55 percent.
    Keywords: ASTRONOMY
    Type: Solar Physics (ISSN 0038-0938); 90; 199-202
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    NASA TECHNICAL REPORTS
  • 3
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    Coronagraphic observations of two new sungrazing comets (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The discovery has recently been reported of a comet (Howard-Koomen-Michels: 1979 XI) that apparently collided with the sun on 30 August 1979. A report is presented of observations of two additional sungrazers that encountered the sun on 27 January 1981 and 20 July 1981, respectively. Like comet 1979 XI, these two new comets seem to have been members of the Kreutz group of sungrazers, and like 1979 XI the new comets did not reappear after their encounters with the sun. The discovery of three previously unreported comets during the initial 2.3 yr of satellite coronal observations suggests that sungrazers are much more common than one might suppose from the list of only nine known sungrazers observed during the years 1668-1970.
    Keywords: ASTRONOMY
    Type: Nature; 300; Nov. 18
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Mount Wilson solar magnetograph - Scanning and data system (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The paper describes a computer-operated image-scanning and data-collection system for the magnetograph at the Mt. Wilson 150-foot Tower telescope. The system is based on a minicomputer with a 32K word core memory and a generalized interface unit for controlling image motion, a keyboard, and an associated television screen. Operation of the solar image guider and the data-collection assembly is outlined along with the observation and data-reduction procedures. Advantages of the system include the ability to move the image in almost any conceivable fashion, a wide choice of integration times, and increased accuracy in magnetic and Doppler calibrations as well as in setting of the magnetic zero level.
    Keywords: ASTRONOMY
    Type: Solar Physics; 48; June 197
    Format: text
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    NASA TECHNICAL REPORTS
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