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  • 1
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    The velocity pattern of weak solar magnetic fields (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The proper motion of magnetic elements on the quiet sun has been measured by means of local correlation tracking. The existence of a pattern in the intranetwork (IN) flow is confirmed. This velocity field is consistent with the direct Doppler measurement of the horizontal component of the supergranular velocity field. The IN elements generally move toward the network boundaries. By tracking test points, it is confirmed that the magnetic elements converge in areas corresponding to the magnetic network. But because the IN elements are of random polarity, they cannot contribute to the growth or maintenance of the magnetic network. By calculating the cross correlation between the magnetogram and Dopplergram, it is confirmed that the supergranule boundaries and the magnetic network are roughly correlated.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 115; 2 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The contrast of faculae near the solar limb (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The contrast of solar faculae near the limb is measured on direct video images made with the 65 cm vacuum reflector at the Big Bear Solar Observatory. Six broad band filters with different wavelengths from red to violet are used. About 300 images were measured from observations made during the summers of 1983 and 1985. Over 20,000 faculae were measured. By averaging the contrast of faculae and plotting them vs heliocentric angle, it is found that contrast increases monotonically toward the limb for the shorter wavelengths; for longer wavelengths, contrast has a tendency to peak around mu = 0.15, and then decrease toward the extreme limb. The contrast increases as wavelength decreases.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 110; 2 19
    Format: text
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    NASA TECHNICAL REPORTS
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