Observations of solar oscillations of low and intermediate degree

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Solar Oscillations, Solar Velocity, Intermediate Frequencies, Low Frequencies, Velocity Measurement

Scientific paper

Measurements are presented of solar velocity oscillations with spherical harmonic degree 1-139 and angular order ≡0. With an amplitude sensitivity of ≡2 cm s-1, trapped acoustic wave modes of radial orders 2-26 are observed at frequencies between 1.7 and 5.5 mHz. The radial order identifications of low-degree modes previously inferred from theory are confirmed. Only marginal evidence of long-period, gravity-mode oscillations is found.

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