Oscillations in a solar pore

Balthasar, H.; Collados, M.; Muglach, K.
Bibliographical reference

Astronomische Nachrichten, vol. 321, no. 2, p. 121-127.

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2000
Number of authors
3
IAC number of authors
1
Citations
12
Refereed citations
11
Description
Temporal variations of a solar pore were observed at the ground based Vacuum Tower Telescope (VTT) on Tenerife and with the satellite TRACE. At the VTT Stokes I and V of the iron line at 1.56 mu m, originating in the deep photosphere, was measured. TRACE delivered UV images at 170 nm which show chromospheric continuum. In a part of the pore we find oscillations of the magnetic field in the 5 minute range. Velocities derived from shifts of the Stokes V profiles show 5 minutes everywhere in the pore, but the coherence of magnetic field and velocities is low. The intensity at 170 nm varies with 3 minutes, and for a part of the whole time series additionally with 4 minutes.
Type