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http://hdl.handle.net/2248/3578
Title: | Study of Sun's "hydromagnetic" Oscillations Using Sunspot Data |
Authors: | Gokhale, M. H Javaraiah, J Hiremath, K. M |
Keywords: | hydromagnetic Oscillations Spherical-harmonic-fourier |
Issue Date: | 1990 |
Publisher: | International Astronomical Union |
Citation: | IAU symposium, No.138, pp. 375 - 378 |
Abstract: | Spherical-harmonic-fourier (SHF) analysis of sun’s ‘nominal toroidal magnetic field’, computed using sunspot data during 1874-1976, shows that sunspot activity can be considered as possibly originating in interference of sun’s axi-symmetric hydromagnetic’ oscillations of odd degrees up to l ≈ 21 and periods ≈ 22y. The relative amplitudes and relative phases of these oscillations remain fairly constant, leading to butterfly diagrams with stable latitude –time correlations on all latitude scales >9degree the amplitudes and the phases however undergo slow coherent variations. The main modes (l<11) represent an approximately standing oscillation. The mean power spectrum can be fitted excellently to the form al exp (-bl) expected for waves trapped between the poles. |
URI: | http://hdl.handle.net/2248/3578 |
ISSN: | 0074-1809 |
Appears in Collections: | IIAP Publications |
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File | Description | Size | Format | |
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Study of Sun's "hydromagnetic" Oscillations Using Sunspot Data | 315.07 kB | Adobe PDF | View/Open |
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