Title
Secular variation of 1.3-year latitude oscillations of magnetic zone boundaries during 1915-2000Secular variation of 1.3-year latitude oscillations of magnetic zone boundaries during 1915-2000
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Department of Physics
Non-linear Waves
Publication type
conferenceObject
Publication
Subject
Physics
Source (journal)
Solar Variability: from core to outer frontiers, vols 1 & 2
Source (book)
10th European Solar Physics Meeting, SEP 09-14, 2002, PRAGUE, CZECH REPUBLIC
Volume/pages
506(2002), p. 173-176
ISSN
0379-6566
ISBN
92-9092-816-6
ISI
000181080400040
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
We have computed and analyzed the average latitude per solar rotation of 36 zone boundaries of the large-scale magnetic field, which have been detected by Ha filaments and prominences during 1915-2000. We have found two types of the latitude oscillations of the zone boundaries with the quasi-periods of about 1.3 and 2.3-years (17 and 30 solar rotations). We consider that 1.3-year latitude periodicity of the filament bands connected with the same oscillations at the tachocline (Komm et al. (2000), Howe et al. (2001)). We have found the secular variation or an increase of a period of about 1.3-year oscillations from 1.1 year in 1915 up to 1.4 year in 2000. Second type of the latitude oscillations is about 2.3-year that concerns to quasi-biennial cycle. Properties of 1.3 and 2.3-year latitude oscillations of the filament bands during 1915-2000 are discussed.
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