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Polarized radiation shows signature of magneto-acoustic wave propagation (moderate field)

Author: Vigeesh Gangadharan
Affiliation: Indian Institute of Astrophysics, India; Kiepenheuer-Institut für Sonnenphysik, Germany.

Co-authors: O. Steiner, S. S. Hasan

Main category: Natural Sciences (Astronomy)

Variation of Stokes-V profiles of Fe I (5250.2 Å and 6302.5 Å) emerging from a small region on either side of the magnetic flux sheet (moderate field strength) as a result of wave propagation within the line-of-sight. The emergent Stokes-V profile over the whole domain does not show any significant variation with time (not shown in the animation).

Further information:
Polarized radiation in spectral lines of Fe I show clear evidence of the wave phenomena. The Stokes-V profile become asymmetric, showing opposite temporal behaviour on the two sides of the flux-sheet axis. We show that polarimetric signatures of wave propagation in magnetic elements can be observed, provided the spatial resolution is high enough that the magnetic feature can be observed in different locations within the flux concentration.

Further Reading: Vigeesh, G.; Steiner, O.; Hasan, S. S., Stokes diagnostics of magneto-acoustic wave propagation in the magnetic network on the Sun, 2011, Solar Physics, 273, 15.

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