The sudden increase of solar and geomagnetic acitivity after 1923 as a manifestation of a non-linear solar dynamo

There are some indications that the coupling function between the polar and the toroidal solar magnetic field strengths are time dependent. Therefore, as proxy data of these strengths, the relationship between long-term modulation of solar and geomagnetic activity is analyzed here by means of a wave...

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Autor principal: Duhau, Silvia Noemí Catalina
Otros Autores: Chen, Charles Yidam
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2002
Acceso en línea:Registro en Scopus
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100 1 |a Duhau, Silvia Noemí Catalina 
245 1 4 |a The sudden increase of solar and geomagnetic acitivity after 1923 as a manifestation of a non-linear solar dynamo 
260 |c 2002 
270 1 0 |m Duhau, S.; Departmento de Fisica, Universidad de Buenos Aires, Ciudad Universitaria, Pab 1. 1428, Buenos Aires, Argentina; email: duhau@df.uba.ar 
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506 |2 openaire  |e Política editorial 
520 3 |a There are some indications that the coupling function between the polar and the toroidal solar magnetic field strengths are time dependent. Therefore, as proxy data of these strengths, the relationship between long-term modulation of solar and geomagnetic activity is analyzed here by means of a wavelet multi-resolution analysis of yearly means of sunspot number and geomagnetic index aa since 1844. It is found that aa index and relative sunspot number long-term modulations oscillate around constant levels that have increased to be 1.9 and 1.6, respectively of its values prior 1923. The oscillations of the aa and Rz long-term modulation appear to be well represented by the superposition of a decadal cycle and the Gleissberg cycle. The amplitude ratio and the phase shift between the Rz and aa decadal cycles changed sharply at year 1923, and the Gleissberg cycle was interrupted to be restarted at year 1949. The synchronicity of these changes with temporal changes in several solar and solar-terrestrial variables indicates that the non-linear nature of the solar dynamo has lead to a major change of its background state after 1923.  |l eng 
593 |a Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina 
593 |a School of Electrical Engineering, Cornell University, NY, United States 
690 1 0 |a MAGNETIC FIELDS 
690 1 0 |a MODULATION 
690 1 0 |a OSCILLATIONS 
690 1 0 |a PHASE SHIFT 
690 1 0 |a SUNSPOT NUMBER 
690 1 0 |a GEOMAGNETISM 
690 1 0 |a GEOMAGNETIC FIELD 
690 1 0 |a SOLAR ACTIVITY 
690 1 0 |a SUNSPOT 
700 1 |a Chen, Charles Yidam 
773 0 |d 2002  |g v. 29  |h pp. 6-1 - 6-4  |k n. 13  |p Geophys. Res. Lett.  |x 00948276  |w (AR-BaUEN)CENRE-822  |t Geophysical Research Letters 
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856 4 0 |u https://hdl.handle.net/20.500.12110/paper_00948276_v29_n13_p6_Duhau  |y Handle 
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962 |a info:eu-repo/semantics/article  |a info:ar-repo/semantics/artículo  |b info:eu-repo/semantics/publishedVersion 
999 |c 66270 

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