Zhang Jun1; J Woch2; S Solanki2
Source Publicationchinesejournalofastronomyandastrophysics
AbstractData from the Solar Wind Ion Composition Spectrometer (SWICS) on Ulysses and synoptic maps from Kitt Peak are used to analyze the polar coronal holes of solar activity cycles 22 and 23 (from 1990 to end of 2003). In the beginning of the declining phase of solar cycles 22 and 23, the north polar coronal holes (PCHs) appear about one year earlier than the ones in the south polar region. The solar wind velocity and the solar wind ionic charge composition exhibit a characteristic dependence on the solar wind source position within a PCH. From the center toward the boundary of a young PCH, the solar wind velocity decreases, coinciding with a shift of the ionic charge composition toward higher charge states. However, for an old PCH, the ionic charge composition does not show any obvious change, although the latitude evolution of the velocity is similar to that of a young PCH.
Document Type期刊论文
2.Max-Planck-Institut fiir Sonnensystemforschung, Katlenburg-Lindau, D-37191
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang Jun,J Woch,S Solanki. polarcoronalholesduringsolarcycles22and23[J]. chinesejournalofastronomyandastrophysics,2005,5(5):531.
APA Zhang Jun,J Woch,&S Solanki.(2005).polarcoronalholesduringsolarcycles22and23.chinesejournalofastronomyandastrophysics,5(5),531.
MLA Zhang Jun,et al."polarcoronalholesduringsolarcycles22and23".chinesejournalofastronomyandastrophysics 5.5(2005):531.
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