Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20..491s&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 20, Issue 3, pp.491-498
Astronomy and Astrophysics
Astronomy
1
Solar Magnetic Field, Solar Cycle, Quasi-Biennial Oscillations
Scientific paper
This work continues the series of papers analyzing the nature of the large-scale solar magnetic field (LSSMF) over a long time interval (1915-1990). We used the data inferred from observations of H filaments. SWAN and WAVELET analyses show that Quasibiennial Oscillations are connected with the lowest multipoles, in other words, with the global part of the LSSMF. For multipoles with number larger than 4 the power of the spectrum in the range of 2-3 years decreases abruptly. The LSSMF zonal and sectorial components (both odd and even) were calculated and the Fourier spectra were obtained. This allowed us to compare the amplitudes of different harmonics. Quasibiennial oscillations are best pronounced in the odd sectorial structures. QBO are absent at the cycle minima in the spectra based on the Stanford data (i.e., with the field strength taken into account). Contrary to that, QBO are of the same order over the entire time interval in the spectra based on H data (i.e., where the field structure is emphasized).
Obridko Vladimir N.
Shelting B. D.
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