Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh43a..04l&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH43A-04
Physics
7509 Corona, 7524 Magnetic Fields, 7529 Photosphere
Scientific paper
We studied periodicities of the large-scale solar magnetic field from 1977 to 2003. We applied the wavelet technique for spectral analysis of the photospheric magnetic field (obtained from the National Solar Observatory at Kitt Peak) and the source surface field (supplied by the Wilcox Solar Observatory at Stanford). The analysis was performed in 36 latitude bands for both data sets. Several quasi-periodic oscillations (1.1 yr, 1.93 yr, 3.12 yr and 4.4 yr) were detected in the range from 1 to 11 yr. We tried to discriminate the fundamental modes of field variability from spurious components, by applying different filters to the data. Moreover, we located in the solar latitude and height the space domain of the oscillations. This allowed to associate each variability mode to either of the two basic components (poloidal or toroidal) of the solar field. We checked our results investigating also the variability of magnetic field proxies such as the sunspot areas and the coronal green line brightness.
Laurenza Monica
Moreno Giovani
Storini Marisa
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