Ring-Diagram Analysis of Data From the Mt Wilson Magneto-Optic Filter

Details Ring-Diagram Analysis of Data From the Mt Wilson Magneto-Optic Filter Ring-Diagram Analysis of Data From the Mt Wilson Magneto-Optic Filter

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp23c..05r&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP23C-05

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7522 Helioseismology

Scientific paper

Full-disc high-resolution (4") Doppler data are available at a one-minute cadence on a near-daily basis from the Magneto-Optic Filter on the Mt Wilson 60-ft Tower Telescope from 1988 onwards. Although coming from an instrument that is less stable than the space-based MDI and has a lower duty cycle than the 6-site GONG+ network, the Mt Wilson series is virtually the sole source of data extending back before 1996 to which the techniques of local-area heleioseismology might be usefully applied. Ring-diagram analysis, which in many respects is just an extension of the techniques of high-degree global-mode helioseismology, is particularly promising for these data. Here we report on initial analyses of selected time samples from the Mt Wilson data series, comparing them where possible with results obtained from other data sources during periods of overlap.

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