Abstract
We analyze oscillation behaviours in chromospheric internetwork regions using spectral observations of the CII 1334 angstrom line obtained with the Solar Ultraviolet Measurements of Emitted Radiation spectrograph (SUMER) aboard Solar and Heliospheric Observatory (SOHO). Three areas, 26 x 120 arcsec(2) each, at the various latitudes from the disk center to the north polar coronal hole, were rastered with a cadence of about 40-60 s in the solar minimum year. We obtained the time evolution of two-dimensional (2D) line intensity, continuum and line core shift. The continuum and the line shift show similar to 3 min chromospheric oscillations in the internetwork regions underlying the coronal hole as well as at the disk center: We find that the CII 1334 angstrom line shift oscillates with an average speed of similar to 1.7 km s(-1), independent of the latitude, while its coherent scale decreases with latitude. On the other hand, the oscillation amplitude of the continuum around the 1334 angstrom and the phase delay between the Doppler shift and continuum slightly increase with latitude.
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