Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...541..436h&link_type=abstract
The Astrophysical Journal, Volume 541, Issue 1, pp. 436-441.
Astronomy and Astrophysics
Astronomy
2
Stars: Activity, Sun: Sunspots
Scientific paper
Activity in solar-like stars is often characterized by one, or at most a handful, of proxy spectral indicators such as Ca II H and K or Hα. In this paper we define and explore composite spectral indices (CSIs), which are derived from consideration of the simultaneous behavior of larger sets of related spectral lines. With judiciously defined CSIs, we can examine the short- and long-term variability in a set of solar or stellar spectra in a complementary way to the traditional K index. In this paper we demonstrate this method, using our solar data series spanning the cycle 22/23 minimum and the initial rise of cycle 23, from 1994 through 1999, and using initial CSIs chosen to be sensitive to the presence of sunspots. We find that despite the relative inactivity of the Sun during the time period in question, analysis of the CSIs reveals the change in sunspot number through solar minimum in a well-defined way. Manifestation of this solar property in the CSIs indicates their utility for study of other physical characteristics in the same way, as well as for comparison of the Sun's physical properties and low-level variability to individual solar analogs.
Hall Jeffrey Clifton
Lockwood Wesley G.
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