Comparison of GONG+ Velocity and Intensity Local Acoustic Spectra via Ring Diagrams

Details Comparison of GONG+ Velocity and Intensity Local Acoustic Spectra via Ring Diagrams Comparison of GONG+ Velocity and Intensity Local Acoustic Spectra via Ring Diagrams

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp31a13j&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP31A-13

Physics

7522 Helioseismology

Scientific paper

The local acoustic spectra of small regions over the solar surface have been studied by using the ring diagram technique. The data used here consist of velocity and intensity images obtained by GONG+ instrument at Tucson for the period from 2000 June 10-15. By studying the local regions on the solar surface, we construct a three-dimensional power spectrum (ω , kx, ky) of high degree solar acoustic modes. A suitable normalization is applied to both the spectra in order to investigate any observable difference in the size and power of the rings. This will be compared to the differences observed in global acoustic spectra obtained in velocity and intensity to provide information about the driving and damping of local acoustic oscillations.

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