Measurement of the rotational frequency splitting of the solar five-minute oscillations from magneto-optical filter observations

Details Measurement of the rotational frequency splitting of the solar five-minute oscillations from magneto-optical filter observations Measurement of the rotational frequency splitting of the solar five-minute oscillations from magneto-optical filter observations

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..141t&link_type=abstract

In ESA, Seismology of the Sun and Sun-Like Stars p 141-147 (SEE N89-25819 19-92)

Physics

2

Photosphere, Solar Activity Effects, Solar Interior, Solar Oscillations, Solar Rotation, Solar Cycles, Time Series Analysis, Velocity Distribution

Scientific paper

Observations of the solar 5 min oscillations in the photospheric velocity field were obtained during the summer of 1984 at the 60-ft solar tower of the Mt. Wilson Observatory with a magneto-optical filter. The magneto-optical filter employs magneto-optical effects in an atomic vapor to isolate narrow bandpasses in alternate wings of a spectral line. Time series of full disk velocity images having a resolution of 10 arcsec and a noise level of 15 m/s/pixel were obtained on 92 days between May and Sept. 1984. A subset of two time series from this data of 16 and 19 days duration having a total of 25,744 Doppler images were analyzed to provide estimates of the rotational frequency splitting for spherical harmonic degrees between 5 and 120. The results of this analysis indicate a decrease in the rate of solar rotation with increasing depth inside the Sun. Also, a decrease in the rate of differential rotation with increasing depth is observed.

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