Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)

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Spectral analysis has been applied to time series of monthly mean values of D, H and Z components of the geomagnetic field recorded at the Huancayo Observatory (HMO). The maximum entropy spectral analysis technique, according to the algorithm by J.P. Burg, was used to calculate the coefficients for...

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Detalles Bibliográficos
Autores: Rojas Acuña, Joel, Bravo Cabrejos, Jorge A.
Formato: artículo
Fecha de Publicación:1999
Institución:Universidad Nacional Mayor de San Marcos
Repositorio:Revistas - Universidad Nacional Mayor de San Marcos
Lenguaje:español
OAI Identifier:oai:ojs.csi.unmsm:article/8591
Enlace del recurso:https://revistasinvestigacion.unmsm.edu.pe/index.php/fisica/article/view/8591
Nivel de acceso:acceso abierto
Materia:geomagnetism
spectral analysis
time series
geomagnetismo
análisis espectral
series de tiempo
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dc.title.none.fl_str_mv Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
Análisis espectral de las Medias Mensuales del Campo Geomagnético en el Observatorio de Huancayo (desde 1922 hasta 1990)
title Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
spellingShingle Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
Rojas Acuña, Joel
geomagnetism
spectral analysis
time series
geomagnetismo
análisis espectral
series de tiempo
title_short Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
title_full Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
title_fullStr Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
title_full_unstemmed Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
title_sort Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)
dc.creator.none.fl_str_mv Rojas Acuña, Joel
Bravo Cabrejos, Jorge A.
author Rojas Acuña, Joel
author_facet Rojas Acuña, Joel
Bravo Cabrejos, Jorge A.
author_role author
author2 Bravo Cabrejos, Jorge A.
author2_role author
dc.subject.none.fl_str_mv geomagnetism
spectral analysis
time series
geomagnetismo
análisis espectral
series de tiempo
topic geomagnetism
spectral analysis
time series
geomagnetismo
análisis espectral
series de tiempo
description Spectral analysis has been applied to time series of monthly mean values of D, H and Z components of the geomagnetic field recorded at the Huancayo Observatory (HMO). The maximum entropy spectral analysis technique, according to the algorithm by J.P. Burg, was used to calculate the coefficients for the errorprediction filter, and Akaike's criteria was used to obtain the length of the error prediction filter. The technique of fast Fourier transform as also applied to the same data with the porpose of comparison with the results obtained with the maximum entropy technique. Polynomials of second and third degrees were fitted to the D and H time series respectively by the least squares method, and a Fourier series with 30 harmonics was fitted to the Z time series. After removal of the tendency, which explains much of the secular variation of internal origin, the residual variations exhibit fluctuations of external origin. The existence of a ~34 year spectral line is resolved very intensely in the D and H records. A period of 10.6 years, related to the solar cycle (11 years) is resolved in D and H, and a period of 26.9 months, related to the quasibiennieal (26 months) is resolved in Z. The annual and semiannual periods are resolved in all the spectra with both methods. Periods of nearly 2.5, 3 and 4 months are detected in all the spectra with both methods. The obtained periods are related to external variations except that of ~34 years which could be the first harmonic of the ~60 year period [11] of internal origin.
publishDate 1999
dc.date.none.fl_str_mv 1999-04-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://revistasinvestigacion.unmsm.edu.pe/index.php/fisica/article/view/8591
10.15381/rif.v1i02.8591
url https://revistasinvestigacion.unmsm.edu.pe/index.php/fisica/article/view/8591
identifier_str_mv 10.15381/rif.v1i02.8591
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv https://revistasinvestigacion.unmsm.edu.pe/index.php/fisica/article/view/8591/7442
dc.rights.none.fl_str_mv Derechos de autor 1999 Joel Rojas Acuña, Jorge A. Bravo Cabrejos
https://creativecommons.org/licenses/by-nc-sa/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Derechos de autor 1999 Joel Rojas Acuña, Jorge A. Bravo Cabrejos
https://creativecommons.org/licenses/by-nc-sa/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Mayor de San Marcos
publisher.none.fl_str_mv Universidad Nacional Mayor de San Marcos
dc.source.none.fl_str_mv Revista de Investigación de Física; Vol. 1 No. 02 (1998); 41-51
Revista de Investigación de Física; Vol. 1 Núm. 02 (1998); 41-51
1728-2977
1605-7724
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spelling Spectral Analysis of Monthly Averages of Geomagnetic Field in Huancayo Observatory (1922 - 1990)Análisis espectral de las Medias Mensuales del Campo Geomagnético en el Observatorio de Huancayo (desde 1922 hasta 1990)Rojas Acuña, JoelBravo Cabrejos, Jorge A.geomagnetismspectral analysistime seriesgeomagnetismoanálisis espectralseries de tiempoSpectral analysis has been applied to time series of monthly mean values of D, H and Z components of the geomagnetic field recorded at the Huancayo Observatory (HMO). The maximum entropy spectral analysis technique, according to the algorithm by J.P. Burg, was used to calculate the coefficients for the errorprediction filter, and Akaike's criteria was used to obtain the length of the error prediction filter. The technique of fast Fourier transform as also applied to the same data with the porpose of comparison with the results obtained with the maximum entropy technique. Polynomials of second and third degrees were fitted to the D and H time series respectively by the least squares method, and a Fourier series with 30 harmonics was fitted to the Z time series. After removal of the tendency, which explains much of the secular variation of internal origin, the residual variations exhibit fluctuations of external origin. The existence of a ~34 year spectral line is resolved very intensely in the D and H records. A period of 10.6 years, related to the solar cycle (11 years) is resolved in D and H, and a period of 26.9 months, related to the quasibiennieal (26 months) is resolved in Z. The annual and semiannual periods are resolved in all the spectra with both methods. Periods of nearly 2.5, 3 and 4 months are detected in all the spectra with both methods. The obtained periods are related to external variations except that of ~34 years which could be the first harmonic of the ~60 year period [11] of internal origin.El análisis espectral ha sido aplicado a las series de tiempo de los valores medios mensuales de las componentes D, H y Z del campo geomagnético resgistrado en el Observatorio Magnético de Huancayo (OMH). Se utilizó el análisis espectral de máxima entropía según el algorítmo de J.P. Burg para calcular los coeficientes del filtro de error de precicción y el criterio de Akaike para obtener la longitud del filtro de error de predicción. También se aplicó la técnica de transformada de Fourier rápida a los mismos datos con la finalidad de comparación con los resultados obtenidos por el método de máxima entropía. Polinomios de segundo y tercer grado se ajustaron a las series de tiempo de D y H, respectivamente, por mínimos cudrados y una serie de Fourier con 30 armónicos se ajustó a la serie de tiempo de Z. Después de remover la tendencia, que explica mucho de la variación secular de origen interno, las variaciones residuales exhiben fluctuaciones de origen externo. La existencia de una línea espectral de ~ 34 es resuelta muy intensa en D y H; un periódo de 10.6 años, relacionada con el ciclo solar (11 años) es resuelta en D y H; y un periódo de 26.9 meses, relacionada con el ciclo cuasibienal (26 meses), es resuleta en Z. Los períodos anual y semianual son resueltos en todos los espectros y con ambos métodos. Períodos cercanos a 2.5, 3 y 4 meses son detectados en todos los espectros y con ambos métodos. Los períodos obtenidos están relacionados a variaciones externas excepo el de ~ 34 años que puede ser el primer armónico del período de ~ 60 años[11] de origen interno.Universidad Nacional Mayor de San Marcos1999-04-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistasinvestigacion.unmsm.edu.pe/index.php/fisica/article/view/859110.15381/rif.v1i02.8591Revista de Investigación de Física; Vol. 1 No. 02 (1998); 41-51Revista de Investigación de Física; Vol. 1 Núm. 02 (1998); 41-511728-29771605-7724reponame:Revistas - Universidad Nacional Mayor de San Marcosinstname:Universidad Nacional Mayor de San Marcosinstacron:UNMSMspahttps://revistasinvestigacion.unmsm.edu.pe/index.php/fisica/article/view/8591/7442Derechos de autor 1999 Joel Rojas Acuña, Jorge A. Bravo Cabrejoshttps://creativecommons.org/licenses/by-nc-sa/4.0info:eu-repo/semantics/openAccessoai:ojs.csi.unmsm:article/85912020-07-30T18:37:00Z
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