Issue |
A&A
Volume 475, Number 3, December I 2007
|
|
---|---|---|
Page(s) | 1101 - 1109 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20078124 | |
Published online | 24 September 2007 |
Search for photospheric footpoints of quiet Sun transition region loops
1
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain e-mail: jos@iac.es
2
Max-Planck-Institut für Sonnensystemforschung, Max-Plank Str. 2, 37191 Katlenburg-Lindau, Germany e-mail: [teriaca;schuehle]@mps.mpg.de
3
Sterrenkundig Instituut, Universiteit Utrecht, PO Box 80000, 3508 TA Utrecht, The Netherlands e-mail: [P.Suetterlin;R.J.Rutten]@astro.uu.nl
4
INAF-Osservatorio Astrofisico di Catania, 95123 Catania, Italy e-mail: dspadaro@oact.inaf.it
Received:
20
June
2007
Accepted:
18
September
2007
Context. The footpoints of quiet Sun Transition Region (TR) loops do not seem to coincide with the photospheric magnetic structures appearing in traditional low-sensitivity magnetograms.
Aims.We look for the so-far unidentified photospheric footpoints of TR loops using G-band bright points (BPs) as proxies for photospheric magnetic field concentrations.
Methods.We compare TR measurements with SoHO/SUMER and photospheric magnetic field observations obtained with the Dutch Open Telescope.
Results.Photospheric BPs are associated with bright TR structures, but they seem to avoid the brightest parts of the structure. BPs appear in regions that are globally redshifted, but they avoid extreme velocities. TR explosive events are not clearly associated with BPs.
Conclusions. The observations are not inconsistent with the BPs being footpoints of TR loops, although we have not succeeded to uniquely identify particular BPs with specific TR loops.
Key words: Sun: activity / Sun: magnetic fields / Sun: photosphere / Sun: transition region
© ESO, 2007
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.