Oscillations of sunspot magnetic fields

Details Oscillations of sunspot magnetic fields Oscillations of sunspot magnetic fields

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335l..97r&link_type=abstract

Astronomy and Astrophysics, v.335, p.L97-L100 (1998)

Astronomy and Astrophysics

Astrophysics

39

Sun: Activity, Magnetic Fields, Oscillations, Photosphere, Sunspots

Scientific paper

We report on velocity and magnetic field oscillations observed in sunspots using the MDI instrument onboard SOHO. In addition to the well-known velocity oscillations, the data clearly show highly localised oscillations of the magnetogram signal in different parts of the sunspots. We show that only oscillations of the magnetic field vector can produce the observed magnetogram oscillations, and that the observed phase relations suggest an origin in terms of magnetoacoustic gravity waves.

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