  Chromospheric wave activity around flares and filaments has been a research
focus for years, and could provide indirect measurements of local conditions
that are not otherwise accessible. One interesting observed phenomenon is
oscillations in filaments, activated by distant flares and the large-scale
waves they produce. Characteristics of these oscillations, such as periods,
amplitudes, and lifetimes, can provide unique information about the filament.
We measure oscillation properties in flares and filaments from H-alpha
chromospheric data using a new method that provides important spatial and
frequency content of the dynamics. We apply the method to two flare events
where filaments are observed to oscillate and determine their properties. We
find strong oscillatory signal in flaring active regions in the chromosphere
over a range of frequencies. Two filaments are found to oscillate without any
detectable chromospheric wave acting as an activation mechanism. We find that
filaments oscillate with periods of tens of minutes, but variations are
significant at small spatial scales along the filamentary region. The results
suggest there is a frequency dependence of the oscillation amplitude, as well
as a spatial dependence along single filaments that is more difficult to
quantify. It also appears that the strength of the oscillations do not
necessarily depend on the strength of the trigger, although there are other
possible effects that make this conclusion preliminary. Applications of this
technique to other events and different data sets will provide important new
insights into the local energy densities and magnetic fields associated with
dynamic chromospheric structures.
