  We study chromospheric oscillations including umbral flashes and running
penumbral waves in a sunspot of active region (AR) using scanning spectroscopy
in H-alpha and Ca II 8542A, with the Fast Imaging Solar Spectrograph (FISS) at
the 1.6 meter New Solar Telescope at Big Bear Solar Observatory. A bisector
method is applied to spectral observations to construct chromospheric Doppler
velocity maps. Temporal sequence analysis of these shows enhanced
high-frequency oscillations inside the sunspot umbra in both lines. Their peak
frequency gradually decreases outward from the umbra. The oscillation power is
found to be associated with magnetic-field strength and inclination, with
different relationships in different frequency bands.
