Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0132i&link_type=abstract
American Astronomical Society, SPD Meeting #31, #01.32; Bulletin of the American Astronomical Society, Vol. 32, p.807
Astronomy and Astrophysics
Astronomy
Scientific paper
This paper combines the novel techniques of wavelet analysis and genetic algorithms to exploit SOHO-SUMER (Solar Ultraviolet Measurements of Emitted Radiation) data in a new way. The data consists of time series in O I 1306.03 Angstroms, Si II 1309.28 Angstroms, C I 1311.36 Angstroms, C II 1334.53 Angstroms, He I 584 Angstroms, O I 1152 Angstroms, and C III 1176 Angstroms tracking specific pieces of quiet Sun westward across the disk. To analyse this data, genetic algorithms (McIntosh et. al, A.& A. Suppl. Ser., 132, 145, 1998) are used to fit quiet Sun emission spectra, allowing the unbiassed determination of spectral properties such as total line intensity and Doppler velocity. Time series of line intensity and Doppler velocity are formed which are then analysed using wavelet techniques, permitting the distinguishing of distinct oscillation wave packets in the time series. Correlations of wave packets between different lines and physical quantities are discussed, as are the distributions of oscillation packets seen.
Fleck Bernard
Ireland Jack
McIntosh Scott W.
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