Balthasar, H.; Collados, M.; Muglach, K.
Bibliographical reference
Astronomische Nachrichten, vol. 321, no. 2, p. 121-127.
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2000
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.