A Comparison of GONG+ and MDI

Details A Comparison of GONG+ and MDI A Comparison of GONG+ and MDI

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp31a11t&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP31A-11

Physics

7594 Instruments And Techniques, 7599 General Or Miscellaneous

Scientific paper

Simultaneous full-disk solar velocity images as recorded by the MDI instrument on-board the SOHO spacecraft and by the GONG+ prototype instrument in Tucson, AZ were decomposed into time series of spherical harmonic coefficients up to degree-l=1200. Cross-correlations of the time-series for each degree, l, and azimuthal order, m, show good agreement up to l~ ~600 (correlation coefficient ~0.0.85). Above this l-value, atmospheric seeing progressively degrades the correlation. The GONG+ power spectra show clear p-mode ridges out to l=1000.

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