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Phase Spectra Seen from Space

Published online by Cambridge University Press:  08 February 2017

Th. Straus ,
F.-L. Deubner ,
B. Fleck ,
C. Marmolino ,
G. Severino  and
T. Tarbell
Th. Straus
Affiliation:
Osservatorio Astronomico di Capodimonte, Napoli, Italy
F.-L. Deubner
Affiliation:
Institut für Astronomie und Astrophysik, Würzburg, Germany
B. Fleck
Affiliation:
ESA Space Science Department, NASA/GSFC, Greenbelt, USA
C. Marmolino
Affiliation:
Università “Federico II”, Napoli, Italy
G. Severino
Affiliation:
Osservatorio Astronomico di Capodimonte, Napoli, Italy
T. Tarbell
Affiliation:
Lockheed-Martin Advanced Technology Center, Palo Alto, USA

Extract

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A 15 hour time series of simultaneous spectroscopic measurements of the continuum intensity, Doppler shift, and line depth in the Ni I 6768Å line at disk center of the quiet sun has been obtained during a guest investigator campaign with the Michelson Doppler Imager (MDI, see Scherrer et al. 1995). In addition, the line intensity has been calculated from the continuum intensity and the line depth data. The spatial shifts due to solar rotation have been approximately removed during the observation run by shifting the CCD read-out area by 1 pixel every 4 minutes. Small residual shifts have been removed during the data analysis. Before applying the Fourier analysis, a (temporal) low pass filtered mean velocity (line of sight component of solar rotation) and mean intensity (center-limb variation) has been removed from each frame. Finally, the continuum intensity (C), line intensity (I), and velocity (V) time series have been subjected to a 3D Fourier transform, yielding κ - ω power, cross power, phase difference, and coherence spectra. The data can now be compared to recent ground-based observations (Deubner, 1990; Deubner et al., 1992; Straus & Bonaccini, 1997).

Type
VII. The Solar Atmosphere
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 455 - 456
Copyright
Copyright © Kluwer 1998 

References

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