Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...443..309m&link_type=abstract
Astronomy and Astrophysics, Volume 443, Issue 1, November III 2005, pp.309-317
Astronomy and Astrophysics
Astrophysics
8
Sun: Magnetic Fields, Sun: Photosphere, Sun: Activity, Sun: Corona
Scientific paper
A large data set of MDI magnetograms is studied to analyze the global dynamics of magnetic structures from network to active regions inside and outside coronal holes. We find a weaker meridional circulation at almost all latitudes, as well as a more differential rotation of the photospheric magnetic structures below high-latitude coronal holes. Stronger asymmetries in the dynamics are observed in coronal holes at high latitude compared to outside coronal holes. The variation in the dynamics is also studied as a function of the coronal hole size as well as its variation with time and with magnetic field. The smaller velocity dispersion obtained in coronal holes when using a cross-correlation technique shows that the large-scale circulation may be inhibited inside coronal holes compared to outside. However, there is an indication of a larger diffusion of magnetic features within coronal holes than outside.
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