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Astron. Astrophys. 335, L97-L100 (1998)

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5. Summary

  • Oscillations have been detected in the Doppler shift and the magnetogram signal in sunspot umbrae.

  • While the velocity signal is observed throughout the umbra, the magnetogram oscillations are highly localised.

  • Different umbrae (even in the same sunspot) can have different magnetic oscillation frequencies.

  • The oscillations of the magnetogram signal cannot be due to cross-talk from the velocity oscillations, but must be intrinsically solar.

  • The observed phase relations between the magnetic and velocity oscillations indicate that the magnetogram oscillations are due to magnetoacoustic gravity waves.

  • The patchy distribution of magnetogram power may be suggestive of an inhomogeneous field in the subphotospheric layers.

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© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998
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