Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177..283m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 283-291. CNRS-supported research.
Astronomy and Astrophysics
Astrophysics
15
Calcium, Chromosphere, Line Spectra, Solar Spectra, Fourier Analysis, Solar Atmosphere, Solar Temperature
Scientific paper
Thermodynamical disturbances in the solar atmosphere can be deduced from observations of line profiles. The authors propose a non-linear method based on Fourier analysis: each profile is converted into a "double profile" for a fast convergence of Fourier expansions. Disturbances of Fourier coefficients are connected theoretically with physical disturbances by second order developments. Temperature and velocity fluctuations are derived from a least square inversion of these developments. The authors apply this method to a time sequence of high resolution profiles of the Ca II 3968 Å line. The accuracy of the results is discussed. The enhanced blue peaks occurring in the asymmetric profiles are interpreted as downward velocity gradients, associated with temperature excesses.
Dame Luc
Malherbe Jean-Marie
Mein Nicole
Mein Pierre
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