  The normal modes of oscillation for a magnetic arcade are used to
analytically solve an initial value problem and estimate the power spectra of
wave frequencies generated by a reconnection event in the solar corona. Over a
realistic range of parameters, I find that such a disturbance generates a peak
power at $\sim10$s$\mathrm{mHz}$ frequencies, but still substantial power up to
$\sim4\mathrm{Hz}$. The cadence and sensitivity of current instrumentation does
not allow observations of oscillations at these frequencies, but in the near
future, new instrumentation will be able to probe this regime, and
observationally determine its energetic importance.
