Variability and dynamics of the outer atmospheric layers in the quiet solar network
Gömöry P.1, Rybák J.1, Kucera A.1, Curdt W.2, Wöhl H.3
1 Astronomical Institute of the Slovak Academy of Sciences,
SK-05960 Tatranská Lomnica, Slovakia
2 Max-Planck-Institut für Sonnensystemforschung, D-37191 Katlenburg-Lindau, Germany
3 Kiepenheuer-Institut für Sonnenphysik, D-79104 Freiburg, Germany
Abstract:
A detailed study of the temporal evolution of the
chromospheric He I 584.33 A and the transition region O V 629.73 A emission line intensities of quiet
supergranular network of the Sun near disk center observed with Coronal Diagnostic Spectrometer (CDS)
is presented. A wavelet analysis of the 1729 s (28.8 min) long temporal series was performed in order
to derive the duration as well as periods of the chromospheric and the transition region oscillations.
The He I line intensities show significant power for periods around 300 s (3.3 mHz), which is relevant
only in the second half of the observing sequence (between 800-1700 s). The temporal evolution corresponding
to the O V line intensities shows strong power around period of 400 s (2.5 mHz), which is significant
during the whole observing sequence as well as the oscillation of lower power for periods of around
250 s (4.0 mHz), which is present only in the middle of the observing sequence (between 700-1300 s).