dc.contributor.author |
Gokhale, M. H |
|
dc.contributor.author |
Javaraiah, J |
|
dc.contributor.author |
Hiremath, K. M |
|
dc.date.accessioned |
2008-09-12T10:58:47Z |
|
dc.date.available |
2008-09-12T10:58:47Z |
|
dc.date.issued |
1990 |
|
dc.identifier.citation |
IAU symposium, No.138, pp. 375 - 378 |
en |
dc.identifier.issn |
0074-1809 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/3578 |
|
dc.description.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. |
en |
dc.language.iso |
en |
en |
dc.publisher |
International Astronomical Union |
en |
dc.relation.uri |
http://adsabs.harvard.edu/abs/1990IAUS..138..375G |
en |
dc.subject |
hydromagnetic Oscillations |
en |
dc.subject |
Spherical-harmonic-fourier |
en |
dc.title |
Study of Sun's "hydromagnetic" Oscillations Using Sunspot Data |
en |
dc.type |
Article |
en |