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  • 1990-1994  (2)
  • 1985-1989
  • 1992  (2)
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  • 1990-1994  (2)
  • 1985-1989
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  • 1
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    Unknown
    High resolution observations: The state of the art and beyond (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The meaning of high resolution and its scientific importance with regard to solar observations is discussed. The state of the art is reviewed, looking into Solar Optical Universal Polarimeter (SOUP) observations, image selection techniques, and adaptive optics. It is concluded that until there are observations in space, complete understanding of processes in the solar photosphere, chromosphere, transition region, and corona will be impossible. The importance of high resolution is considered with regard to solar surface and convection, solar photosphere inside and outside magnetic fields, and sunspot geometry.
    Keywords: ASTRONOMY
    Type: ESA, Solar Physics and Astrophysics at Interferometric Resolution; p 9-14
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Polarimetry and spectroscopy of a simple sunspot. I - On the magnetic field of a sunspot penumbra (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: We investigate the magnetic field structure of a medium sized sunspot using high resolution magnetograms and spectrograms and derive a relationship between the brightness of penumbral structures and the inclination of the magnetic field. The field inclination to the spot normal is larger in the dark structures than in the bright ones. We show that the field strength does not vary between dark and bright structures. At the inner penumbral boundary the field strength is 2000 Gauss and about 1000 Gauss at the outer penumbral edge. The line-of sight component of the material flow decreases rapidly within one arcsecond at the photospheric boundary of the spot.
    Keywords: SOLAR PHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 264; 2; p. L27-L30.
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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