J/A+A/309/655 Solar chromospheric activity (HeI 10830A) (Shcherbakov+, 1996)
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 1996A&A...309..655S (SIMBAD/NED BibCode)
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 λ10830A 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 λ5303 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
(End) Simona Mei [CDS] 07-Sep-1995