Speaker
Apply to be<br> considered for a student <br> award (Yes / No)?
No
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Abstract content <br> (Max 300 words)
The three-minute oscillations in the chromosphere above sunspot umbrae are explained by means of an acoustic resonator. In the vertical magnetic field above umbrae a cavity forms between the photosphere and transition region that acts as a leaky resonator, where the oscillations generate traveling waves that propagate upward into the solar corona. One-dimensional numerical simulations using the ideal magnetohydrodynamic equations demonstrate the existence of the resonator. The shapes and peaks in the resonating spectrum raise the possibility of using the resonator as a means to determine the chromospheric temperature profile above umbrae. A numerical study will be presented of different initiators of the oscillations, as well as the influence of the shape and height of the chromospheric cavity.
