Volume 403, Number 2, May IV 2003
|Page(s)||725 - 730|
|Published online||06 May 2003|
Variability of EUV-spectra from the quiet upper solar atmosphere: Intensity and Doppler shift
Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany
2 Institute of Astronomy, ETH-Zentrum, 8092 Zürich, Switzerland
3 Max-Planck-Institut für Aeronomie, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Corresponding author: A. Brković, firstname.lastname@example.org
Accepted: 11 March 2003
We have studied SUMER and CDS time series of spectra and images of quiet-Sun regions at the solar disc centre. The data contain ultraviolet emission lines sampling temperatures of the chromosphere, transition region and corona. We find a high correlation between average net Doppler shifts and relative brightness variabilities of the studied lines (correlation coefficient of 0.92), suggesting a connection between the two quantities. The anti-correlation between differential emission measures and relative brightness variabilities is weaker (correlation coefficient of -0.78). We discuss the observed relationships on the basis of differential emission measures and linear wave calculations.
Key words: Sun: chromosphere / Sun: corona / Sun: transition region / Sun: UV radiation
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.