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  • 1995-1999  (2)
  • 1990-1994  (1)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Bright rings around sunspots (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 401 (1999), S. 678-679 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There are two possible explanations for why sunspots are dark: the partial suppression by the sunspot magnetic fields of convective energy transport from the underlying layers, or the removal of energy from the sunspot by enhanced hydromagnetic wave radiation. Both processes would reduce the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/44343
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The solar Ca II K index and the Mg II core-to-wing ratio (1994)
    Springer
    Solar physics 152 (1994), S. 69-76 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 1 Å index of the solar Ca II K line is compared with the core-to-wing ratio of satellite measurements of the Mg II h and k lines. The correlation coefficient r = 0.976 for the Nimbus-7 Mg II ratio during solar cycle 21 andr = 0.99 for the NOAA9 Mg II ratio in cycle 22. Linear regression analysis for the full dynamic range of both data sets is used to combine the Nimbus-7 and NOAA9 Mg II data. These relations permit the ground-based Ca K index to estimate the solar UV flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01473185
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Initial CHIP He I Observations of Solar Limb Activity (1998)
    Springer
    Solar physics 182 (1998), S. 97-105 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new instrument capable of 3-min time resolution full-disk and limb observations in the Hei 1083 nm spectral line has been in operation at the High Altitude Observatory's Mauna Loa Solar Observatory (MLSO) since April 1996. We discuss instrument capabilities and performance and present some initial observations of limb activity from the first year of instrument operation. We compare limb Hei and Hα observations of quiescent and active prominences, comment on the role of Doppler shifts in interpreting the Hei observations, and illustrate the use of disk/limb Hei observations of a CME-associated eruptive filament in mass-ejection studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005010304281
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    Paper (German National Licenses)
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