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J/A+A/309/655    Solar chromospheric activity (HeI 10830A) (Shcherbakov+, 1996)
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He I lambda 10830A line as an indicator of solar chromospheric activity
     Shcherbakov A.G., Shcherbakova Z.A., Tuominen I., Jetsu L.
    <Astron. Astrophys. 309, 655 (1996)>
    =1996A&A...309..655S      (SIMBAD/NED BibCode)
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ADC_Keywords: Sun
Keywords: Sun: activity; chromosphere

Description:
    Full disk spectroscopic observations in the near infrared region of
    the solar spectrum (the Sun-as-a-star) are presented for the years
    1981-1993. The central depth of the He I {lambda}10830A line shows
    changes following the 11-year activity cycle, and also variability
    following the rotation of the Sun. We found high correlations between
    the depth of the He I line and coronal indices of activity, such as Fe
    XIV {lambda}5303 coronal emission index and 10.7cm radio flux. Thus
    the He I line depth may be used as an index of activity for the
    chromospheric and low chromospheric-coronal transition region for the
    Sun, observed as a star and, by inference for other late-type stars.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             46      225   Activity indices for the Sun as a star
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Byte-by-byte Description of file: table1
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   Bytes Format  Units      Label    Explanations
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   2-  9  A8     "DD/MM/YY" Date     Date of observations
  11- 20  F10.2  d          JD       Julian Date
  22- 25  F4.1   %          RHeI     Line depth of local continuum (He I 10830A)
  27- 31  F5.2   10+16W/sr  CI       Coronal Index (1)
  33- 35  I3     ---        Nspot    Sunspot number
  37- 41  F5.1   10kJy      Flux     Radio Flux at 10.7 cm (in 10-22W/m2Hz)
  43- 46  I4     uT         SMF      ? Solar Magnetic Field
                                     (in {micro}T=10-2Gauss)
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Note (1): Coronal index as in Rybansky et al. 1988, 1990; Rybansky 1995;
          see page 2 in the paper
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References:
   Rybanski M., Rusin V., Dzifcakova E. 1988, Bull. Astr. Inst. Czech. 39, 106
   Rybanski M., Rusin V., Dzifcakova E. 1990, Bull. Astr. Inst. Czech. 41, 79
   Rybanski M. 1995, private communication
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(End)                                             Simona Mei [CDS]   07-Sep-1995