Unusual behaviour of the IGRF during the 1945–1955 period

Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show un...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Xu, Wen-yao [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2000

Schlagwörter:	Secular Variation Core Radius Unusual Behaviour Truncation Level International Geomagnetic Reference Field

Anmerkung:	© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000

Übergeordnetes Werk:	Enthalten in: Earth, planets and space - Springer Berlin Heidelberg, 1998, 52(2000), 12 vom: Dez., Seite 1227-1233
Übergeordnetes Werk:	volume:52 ; year:2000 ; number:12 ; month:12 ; pages:1227-1233

Links:	Volltext

DOI / URN:	10.1186/BF03352355

Katalog-ID:	SPR036897590

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520			\|a Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models.
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allfields	10.1186/BF03352355 doi (DE-627)SPR036897590 (SPR)BF03352355-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Xu, Wen-yao verfasserin aut Unusual behaviour of the IGRF during the 1945–1955 period 2000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000 Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. Secular Variation (dpeaa)DE-He213 Core Radius (dpeaa)DE-He213 Unusual Behaviour (dpeaa)DE-He213 Truncation Level (dpeaa)DE-He213 International Geomagnetic Reference Field (dpeaa)DE-He213 Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 52(2000), 12 vom: Dez., Seite 1227-1233 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:52 year:2000 number:12 month:12 pages:1227-1233 https://dx.doi.org/10.1186/BF03352355 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 52 2000 12 12 1227-1233
spelling	10.1186/BF03352355 doi (DE-627)SPR036897590 (SPR)BF03352355-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Xu, Wen-yao verfasserin aut Unusual behaviour of the IGRF during the 1945–1955 period 2000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000 Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. Secular Variation (dpeaa)DE-He213 Core Radius (dpeaa)DE-He213 Unusual Behaviour (dpeaa)DE-He213 Truncation Level (dpeaa)DE-He213 International Geomagnetic Reference Field (dpeaa)DE-He213 Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 52(2000), 12 vom: Dez., Seite 1227-1233 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:52 year:2000 number:12 month:12 pages:1227-1233 https://dx.doi.org/10.1186/BF03352355 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 52 2000 12 12 1227-1233
allfields_unstemmed	10.1186/BF03352355 doi (DE-627)SPR036897590 (SPR)BF03352355-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Xu, Wen-yao verfasserin aut Unusual behaviour of the IGRF during the 1945–1955 period 2000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000 Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. Secular Variation (dpeaa)DE-He213 Core Radius (dpeaa)DE-He213 Unusual Behaviour (dpeaa)DE-He213 Truncation Level (dpeaa)DE-He213 International Geomagnetic Reference Field (dpeaa)DE-He213 Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 52(2000), 12 vom: Dez., Seite 1227-1233 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:52 year:2000 number:12 month:12 pages:1227-1233 https://dx.doi.org/10.1186/BF03352355 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 52 2000 12 12 1227-1233
allfieldsGer	10.1186/BF03352355 doi (DE-627)SPR036897590 (SPR)BF03352355-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Xu, Wen-yao verfasserin aut Unusual behaviour of the IGRF during the 1945–1955 period 2000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000 Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. Secular Variation (dpeaa)DE-He213 Core Radius (dpeaa)DE-He213 Unusual Behaviour (dpeaa)DE-He213 Truncation Level (dpeaa)DE-He213 International Geomagnetic Reference Field (dpeaa)DE-He213 Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 52(2000), 12 vom: Dez., Seite 1227-1233 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:52 year:2000 number:12 month:12 pages:1227-1233 https://dx.doi.org/10.1186/BF03352355 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 52 2000 12 12 1227-1233
allfieldsSound	10.1186/BF03352355 doi (DE-627)SPR036897590 (SPR)BF03352355-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Xu, Wen-yao verfasserin aut Unusual behaviour of the IGRF during the 1945–1955 period 2000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000 Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. Secular Variation (dpeaa)DE-He213 Core Radius (dpeaa)DE-He213 Unusual Behaviour (dpeaa)DE-He213 Truncation Level (dpeaa)DE-He213 International Geomagnetic Reference Field (dpeaa)DE-He213 Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 52(2000), 12 vom: Dez., Seite 1227-1233 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:52 year:2000 number:12 month:12 pages:1227-1233 https://dx.doi.org/10.1186/BF03352355 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 52 2000 12 12 1227-1233
language	English
source	Enthalten in Earth, planets and space 52(2000), 12 vom: Dez., Seite 1227-1233 volume:52 year:2000 number:12 month:12 pages:1227-1233
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format_phy_str_mv	Article
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topic_facet	Secular Variation Core Radius Unusual Behaviour Truncation Level International Geomagnetic Reference Field
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author	Xu, Wen-yao
spellingShingle	Xu, Wen-yao ddc 550 bkl 38.70 bkl 39.22 misc Secular Variation misc Core Radius misc Unusual Behaviour misc Truncation Level misc International Geomagnetic Reference Field Unusual behaviour of the IGRF during the 1945–1955 period
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topic_title	550 VZ 38.70 bkl 39.22 bkl Unusual behaviour of the IGRF during the 1945–1955 period Secular Variation (dpeaa)DE-He213 Core Radius (dpeaa)DE-He213 Unusual Behaviour (dpeaa)DE-He213 Truncation Level (dpeaa)DE-He213 International Geomagnetic Reference Field (dpeaa)DE-He213
topic	ddc 550 bkl 38.70 bkl 39.22 misc Secular Variation misc Core Radius misc Unusual Behaviour misc Truncation Level misc International Geomagnetic Reference Field
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title	Unusual behaviour of the IGRF during the 1945–1955 period
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title_full	Unusual behaviour of the IGRF during the 1945–1955 period
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title_sort	unusual behaviour of the igrf during the 1945–1955 period
title_auth	Unusual behaviour of the IGRF during the 1945–1955 period
abstract	Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000
abstractGer	Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000
abstract_unstemmed	Abstract The International Geomagnetic Reference Field (IGRF) for 1900–2000 is testedin this paper. A peculiar behaviour is found in the time variations of higher-degree coefficients of the IGRF models. During the 1945–1955 period the spherical harmonic coefficients gnm and hnm with n > 7 show unusual jumps, while their variations before and after this period are quite smooth. These irregular variations have little effect on the main features of the surface magnetic pattern. However, when we extrapolate the field pattern downward through the insulating mantle to the core-mantle boundary (CMB), the contributions of the higher-degree coefficients become more important and are likely to affect the shape of the geomagnetic energy spectrum, distribution of magnetic flux, and magnetic determination of the conducting core radius. It seems necessary to re-examine and revise these coefficients in the IGRF models. © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2000
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title_short	Unusual behaviour of the IGRF during the 1945–1955 period
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score	7.401737

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Unusual behaviour of the IGRF during the 1945–1955 period

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