Jacket Modes: Solar Acoustic Oscillations Confined to Regions Surrounding Sunspots and Plage

Details Jacket Modes: Solar Acoustic Oscillations Confined to Regions Surrounding Sunspots and Plage Jacket Modes: Solar Acoustic Oscillations Confined to Regions Surrounding Sunspots and Plage

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...453..919b&link_type=abstract

Astrophysical Journal v.453, p.919

Astronomy and Astrophysics

Astronomy

26

Magnetohydrodynamics: Mhd, Sun: Magnetic Fields, Sun: Oscillations, Sun: Sunspots, Waves

Scientific paper

It is demonstrated by the application of classical eigenfunction expansion techniques that the interaction of an incident solar acoustic oscillation, or p-mode, with a scattering obstacle-such as a sunspot involves not only the scattering of the incident p-mode into other p-modes of like frequency (mode mixing), but also the generation of an acoustic halo localized like a "jacket" about the scatterer. This halo oscillates at the same frequency as the incident p-mode and is composed of a superposition of a continuous spectrum of modes referred to as jacket modes. It is pointed out that these jacket modes should appear as a broad enhancement to the background power underlying the p-mode ridges in κ-ω diagrams for regions in close proximity to sunspots and the boundaries of plage The basic results draw upon a remarkable analogy between the oscillations of an adiabatically stratified plane-parallel polytrope and the wave functions for the hydrogen atom: the laterally propagating p-modes that participate in the mode mixing correspond to the negative-energy bounds states of the hydrogen atom, while the continuous spectrum of jacket modes corresponds to the continuum of positive-energy states in which the electron is not bound to the proton.

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