Solar luminosity variation. V - The photospheric lines, 1976-1985

view Abstract Citations (23) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solar Luminosity Variation. V. The Photospheric Lines 1976--1985 Livingston, W. ; Wallace, L. Abstract Kitt Peak full-disk spectrophotometric records for selected spectrum lines observed during the period 1976-1985 are analyzed using improved corrections for water vapor and an instrument slit change. The equivalent width of the ground state line of Mn I 5394.7 A shows the greatest variability and correlates well with Ca K 3933 A intensity. Temperature-sensitive C I 5380.3 A, after some apparently nonthermal activity in 1976-1978, settles down to a near constant level. The equivalent widths of other lines show little or no change with time. Evidence is presented that the source of the variability in Mn I 5394.7 A is not confined to solar plage regions alone. The annual means in the central depth of C I 5380.3 A, interpreted as indicative of fluctuations in T(eff), show a peak-to-peak variation of 0.7 K over 1979-1985. Publication: The Astrophysical Journal Pub Date: March 1987 DOI: 10.1086/165106 Bibcode: 1987ApJ...314..808L Keywords: Line Spectra; Photosphere; Solar Spectra; Stellar Luminosity; Iron; Metallicity; Solar Maximum Mission; Spectral Line Width; Stellar Spectrophotometry; Solar Physics; LINE PROFILES; SUN: ACTIVITY; SUN: ATMOSPHERE; SUN: SPECTRA full text sources ADS |