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On the linear transformation and resonant absorption of Alfvén p-modes in sunspots

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Abstract

We analyse the linear transformation of Alfvén p-modes into quasisurface waves and the resonant absorption of Alfvén p-waves in a slowly varying medium with a density gradient, parallel to the ambient homogeneous magnetic field. It is pointed out, that the energy transfer from Alfvén p-waves to quasisurface waves appear to take place in sunspots. The results obtained also suggest that Alfvén p-waves generated by overstability in sunspots may be absorbed in deep layers under sunspots. Moreover, it is very likely that part of the downward wave flux is reflected and hence it is possibble that essentially the energy from sunspots is transported outward by magnetogravitational waves, to which Alfvén p-waves are transformed.

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  1. Central Astronomical Observatory of the Russia Academy of Sciences at Pulkovo, 196140, Leningrad, Russia

    V. I. Zhukov

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  1. V. I. Zhukov
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Zhukov, V.I. On the linear transformation and resonant absorption of Alfvén p-modes in sunspots. Sol Phys 98, 39–50 (1985). https://doi.org/10.1007/BF00177197

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  • DOI: https://doi.org/10.1007/BF00177197

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