HeI λ10830A line as an indicator of solar chromospheric activity.

Details HeI λ10830A line as an indicator of solar chromospheric activity. HeI λ10830A line as an indicator of solar chromospheric activity.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..655s&link_type=abstract

Astronomy and Astrophysics, v.309, p.655-660

Astronomy and Astrophysics

Astrophysics

3

Sun: Activity: Chromosphere

Scientific paper

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.

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