Physics – Optics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..181c&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 181-184 (SEE N89-25819 19-92)
Physics
Optics
2
Magneto-Optics, Optical Filters, Solar Activity Effects, Solar Observatories, Solar Oscillations, Data Acquisition, Image Analysis, Power Spectra, Spectral Resolution, Sun
Scientific paper
The magneto-optical filter (MOF) was used to get high and intermediate l-modes of solar oscillations. For very low l-modes the imaging capability of the MOF is still attractive since it allows a pixel by pixel intensity normalization. However, a crude attempt to get very low l power spectra from Dopplergrams obtained at Mt. Wilson gave noisy results. This means that a careful analysis of all the factors potentially affecting high resolution Dopplergrams should be accomplished. In order to better investigate this problem, a nonimaging channel using the lock-in amplifier technique was considered. Two systems are now operational, one at JPL and the other at University of Rome. Observations in progress are used to discuss the MOF stability, the noise level, and the possible application in asteroseismology.
Cacciani Alessandro
Marquedant R.
Ricci Damian
Rosati Piero
Smith Edward
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