Line Shape Changes and Doppler Measurements in Solar Active Regions. I. A Method for Correcting Dopplergrams from SOHO MDI

Details Line Shape Changes and Doppler Measurements in Solar Active Regions. I. A Method for Correcting Dopplergrams from SOHO MDI Line Shape Changes and Doppler Measurements in Solar Active Regions. I. A Method for Correcting Dopplergrams from SOHO MDI

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...648.1256w&link_type=abstract

The Astrophysical Journal, Volume 648, Issue 2, pp. 1256-1267.

Astronomy and Astrophysics

Astronomy

11

Sun: Helioseismology, Sun: Oscillations

Scientific paper

We present a method to correct MDI high-resolution Dopplergrams in active regions for systematic observational errors due to the spectral line shape changes. We use a measurement campaign with the Advanced Stokes Polarimeter to investigate the influence of line shape changes in active regions on MDI Dopplergram calibration. An estimate of the width of the Ni I λ6768 absorption line used by MDI to measure velocity provides a linear correction to the standard calibration. This correction can be largely explained by the Zeeman broadening of the absorption line.

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