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  • 1990-1994  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Correlation of He II lyman alpha with He I 10830 Å, and with chromospheric and EUV coronal emission (1993)
    Springer
    Solar physics 147 (1993), S. 29-46 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes the results of comparing SERTS-3 images obtained in the transition region line of Heii 304 Å with chromospheric Hei 10830 Å absorption, with strong coronal lines of Mgix 368 Å, Fexv 284 Å and 417 Å, and Fexvi 335 Å and 31 Å, with Hα, with Caii 8542 Å, and with magnetograms in Fei 8688Hα. All of the images are illustrated, and the image reconstruction techniques used are described and evaluated. The high correlation of the Heii 304 Å and Hei 10830 Å images, originally found by Harvey and Sheeley (1977), is confirmed and is put on a quantitative basis. We find that the supergranulation network has greater contrast, and that filaments appear darker, in 10830 Å than in 304 Å. In active regions, the 304 Å line follows more closely the behavior of Hα and Caii 8542 Å than the 10830 Å line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00675485
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mgix emission lines in an active region spectrum obtained with the Solar EUV Rocket Telescope and Spectrograph (SERTS) (1994)
    Springer
    Solar physics 149 (1994), S. 301-308 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theoretical electron-temperature-sensitive Mgix emission line ratios are presented forR I =I(443.96 Å)/I(368.06 Å),R 2 =I(439.17 Å)/I(368.06 Å),R 3 =I(443.37 Å)/I(368.06 Å),R 4 =I(441.22 Å)/I(368.06 Å), andR 5 =I(448.28 Å)/I(368.06 Å). A comparison of these with observational data for a solar active region, obtained during a rocket flight by the Solar EUV Rocket Telescope and Spectrograph (SERTS), reveals excellent agreement between theory and observation forR 1 throughR 4, with discrepancies that average only 9%. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations, and also resolves discrepancies found previously when the theoretical results were compared with solar data from the S082A instrument on boardSkylab. However in the case ofR 5, the theoretical and observed ratios differ by almost a factor of 2. This may be due to the measured intensity of the 448.28 Å line being seriously affected by instrumental effects, as it lies very close to the long wavelength edge of the SERTS spectral coverage (235.46−448.76 Å).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690618
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A comparison of theoreticalCIV emission line strengths with active region observations obtained with the Solar EUV Rocket Telescope and Spectrograph (SERTS) (1993)
    Springer
    Solar physics 144 (1993), S. 69-74 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theoretical line ratios involving 2s 2 S - 3p 2 P, 2p 2 P - 3s 2 S, and 2p 2 S - 3d 2 D transitions inCiv between 312 and 420 Å are presented. A comparison of these with solar active region observational data obtained during a rocket flight by the Solar EUV Rocket Telescope and Spectrograph (SERTS) reveals good agreement between theory and experiment, with discrepancies that average only 22%. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations, and also resolves discrepancies found previously when the theoretical results were compared with solar data from the S082A instrument on boardSkylab. The potential usefulness of theCIV line ratios as electron temperature diagnostics for the solar transition region is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00667983
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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