Volume 400, Number 3, March IV 2003
|Page(s)||1057 - 1064|
|Published online||07 March 2003|
Atmospheric oscillations in solar magnetic flux tubes
I. Excitation by longitudinal tube waves and random pulses
Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA
2 Institut für Theoretische Astrophysik der Universität Heidelberg, Tiergartenstr. 15, 69121 Heidelberg, Germany
Corresponding author: P. Ulmschneider, firstname.lastname@example.org
Accepted: 7 January 2003
The response of exponentially spreading magnetic flux tubes embedded in an isothermal solar atmosphere to the propagation of longitudinal tube waves and random pulses produced in the solar convection zone is studied analytically. General solutions are presented and applied to solar tube models. It is shown that free atmospheric oscillations inside these flux tubes are generated with oscillation periods near 3 min, which are essentially identical to the oscillation periods observed in the interior regions of supergranulation cells. The observed oscillations are therefore consistent with processes in magnetic tubes as well as in nonmagnetic regions. Stochastic perpetual excitation is expected to keep these flux tube oscillations present at all times. These oscillations are inconsistent with the observed 7-min oscillations in the chromospheric network.
Key words: Sun: photosphere / Sun: chromosphere / Sun: oscillations / physical data and processes: MHD / physical data and processes: waves
© 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.