Abstract：
:Following previous investigations by Giordano and Mancuso [1] and Mancuso and Giordano [2,3] on the differential rotation of the solar corona as obtained through the analysis of the intensity time series of the O VI 1032 Å spectral line observed by the UVCS/SOHO telescope during solar cycle 23, we analysed the possible influence of projection effects of extended coronal structures on the observed differential rotation rate in the ultraviolet corona. Through a simple geometrical model, we found that, especially at higher latitudes, the differential rotation may be less rigid than observed, since features at higher latitudes could be actually linked to much lower coronal structures due to projection effects. At solar maximum, the latitudinal rigidity of the UV corona, with respect to the differential rotating photosphere, has thus to be considered as an upper limit of the possible rigidity. At solar minimum and near the equatorial region throughout the solar cycle, projection effects are negligible.
journal_name
J Adv Resjournal_title
Journal of advanced researchauthors
Mancuso S,Giordano Sdoi
10.1016/j.jare.2012.08.003subject
Has Abstractpub_date
2013-05-01 00:00:00pages
283-6issue
3eissn
2090-1232issn
2090-1224pii
S2090-1232(12)00061-6journal_volume
4pub_type
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