AustralieFrV1, PascalFrancis, Corpus, bibRecord, 006959

Candidate models for the 1995 revision of IGRF, a worldwide evaluation based on observatory monthly means

Identifieur interne : 006959 ( PascalFrancis/Corpus ); précédent : 006958; suivant : 006960

Candidate models for the 1995 revision of IGRF, a worldwide evaluation based on observatory monthly means

Auteurs : Y. Cohen ; M. Alexandrescu ; G. Hulot ; J. L. Le Mouël

Source :

Journal of geomagnetism and geoelectricity [ 0022-1392 ] ; 1997.

RBID : Pascal:97-0406882

Descripteurs français

Pascal (Inist)
- Planète Terre, Etats Unis, Russie, Royaume Uni, Révision, Champ géomagnétique, Observatoire, Correction, Modèle, Anomalie, Variation séculaire.

English descriptors

KwdEn :
- Earth, Russian Federation, United Kingdom, United States, anomalies, corrections, geomagnetic field, models, observatories, revision, secular variations.

Abstract

Three candidate models for the IGRF 1995 description of the 1995.0 main field are evaluated. These are GS-95 proposed by the Goddard Space Flight Center (U.S.A.), IZ-95 proposed by IZMIRAN (Russia) and UB-95 proposed jointly by the US Navy (U.S.A.) and the British Geological Survey (U.K.). These models are tested against a set of December 1994 and January 1995 preliminary monthly mean values kindly provided to us by 73 observatories distributed throughout the world. This procedure has at least two advantages. First, no secular variation corrections are required for the test to be carried out. Second, all datasets used in the construction of the candidate models include observatory annual means up to at most 1993.5 and share similar links to our independent test data set. We, therefore, expect the test to be reasonably unbiased towards any ofthe models. The procedure has the inconvenience ofbeing sensitive to local crustal anomalies, as pointed out by Langel et al. (1982). Indeed, directly comparing predictions from the candidate models to the observed monthly means reveals little else than a common, correlated, hardly discriminating, disagreement mainly due to crustal anomalies. We repeated the comparison after correcting the monthly means for the crustal anomalies derived by Bloxham and Jackson (1992). This second test was much more significant and showed that the models do a comparable job, UB-95 being marginally better. We recommand equal weighing between the two GS-95 and IZ-95 candidate models, and a slightly larger weight for UB-95.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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Format Inist (serveur)

NO :	PASCAL 97-0406882 INIST
ET :	Candidate models for the 1995 revision of IGRF, a worldwide evaluation based on observatory monthly means
AU :	COHEN (Y.); ALEXANDRESCU (M.); HULOT (G.); LE MOUËL (J. L.); BARTON (C. E.); BARRACLOUGH (D. R.); QUINN (J. M.)
AF :	Laboratoire de Géomagnétisme, URA 729 CNRS, Institut de Physique du Globe de Paris, 4 Place Jussieu/75252 Paris/France (1 aut., 2 aut., 3 aut., 4 aut.); Australian Geological Survey Organisation/Canberra ACT 2601/Australie (1 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of geomagnetism and geoelectricity; ISSN 0022-1392; Coden JGEGAB; Japon; Da. 1997; Vol. 49; No. 2-3; Pp. 279-290; Bibl. 16 ref.
LA :	Anglais
EA :	Three candidate models for the IGRF 1995 description of the 1995.0 main field are evaluated. These are GS-95 proposed by the Goddard Space Flight Center (U.S.A.), IZ-95 proposed by IZMIRAN (Russia) and UB-95 proposed jointly by the US Navy (U.S.A.) and the British Geological Survey (U.K.). These models are tested against a set of December 1994 and January 1995 preliminary monthly mean values kindly provided to us by 73 observatories distributed throughout the world. This procedure has at least two advantages. First, no secular variation corrections are required for the test to be carried out. Second, all datasets used in the construction of the candidate models include observatory annual means up to at most 1993.5 and share similar links to our independent test data set. We, therefore, expect the test to be reasonably unbiased towards any ofthe models. The procedure has the inconvenience ofbeing sensitive to local crustal anomalies, as pointed out by Langel et al. (1982). Indeed, directly comparing predictions from the candidate models to the observed monthly means reveals little else than a common, correlated, hardly discriminating, disagreement mainly due to crustal anomalies. We repeated the comparison after correcting the monthly means for the crustal anomalies derived by Bloxham and Jackson (1992). This second test was much more significant and showed that the models do a comparable job, UB-95 being marginally better. We recommand equal weighing between the two GS-95 and IZ-95 candidate models, and a slightly larger weight for UB-95.
CC :	225B01; 001E01M01
FD :	Planète Terre; Etats Unis; Russie; Royaume Uni; Révision; Champ géomagnétique; Observatoire; Correction; Modèle; Anomalie; Variation séculaire
FG :	Amérique du Nord; Eurasie; Europe Ouest; Europe
ED :	Earth; United States; Russian Federation; United Kingdom; revision; geomagnetic field; observatories; corrections; models; anomalies; secular variations
EG :	North America; Eurasia; Western Europe; Europe
SD :	Planeta tierra; Estados Unidos; Rusia; Reino Unido; Revisión; Observatorio; Corrección; Modelo; Anomalía; Variación secular
LO :	INIST-2774.354000065743140080
ID :	97-0406882

Links to Exploration step

Pascal:97-0406882

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<front><div type="abstract" xml:lang="en">Three candidate models for the IGRF 1995 description of the 1995.0 main field are evaluated. These are GS-95 proposed by the Goddard Space Flight Center (U.S.A.), IZ-95 proposed by IZMIRAN (Russia) and UB-95 proposed jointly by the US Navy (U.S.A.) and the British Geological Survey (U.K.). These models are tested against a set of December 1994 and January 1995 preliminary monthly mean values kindly provided to us by 73 observatories distributed throughout the world. This procedure has at least two advantages. First, no secular variation corrections are required for the test to be carried out. Second, all datasets used in the construction of the candidate models include observatory annual means up to at most 1993.5 and share similar links to our independent test data set. We, therefore, expect the test to be reasonably unbiased towards any ofthe models. The procedure has the inconvenience ofbeing sensitive to local crustal anomalies, as pointed out by Langel et al. (1982). Indeed, directly comparing predictions from the candidate models to the observed monthly means reveals little else than a common, correlated, hardly discriminating, disagreement mainly due to crustal anomalies. We repeated the comparison after correcting the monthly means for the crustal anomalies derived by Bloxham and Jackson (1992). This second test was much more significant and showed that the models do a comparable job, UB-95 being marginally better. We recommand equal weighing between the two GS-95 and IZ-95 candidate models, and a slightly larger weight for UB-95.</div>
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<fC01 i1="01" l="ENG"><s0>Three candidate models for the IGRF 1995 description of the 1995.0 main field are evaluated. These are GS-95 proposed by the Goddard Space Flight Center (U.S.A.), IZ-95 proposed by IZMIRAN (Russia) and UB-95 proposed jointly by the US Navy (U.S.A.) and the British Geological Survey (U.K.). These models are tested against a set of December 1994 and January 1995 preliminary monthly mean values kindly provided to us by 73 observatories distributed throughout the world. This procedure has at least two advantages. First, no secular variation corrections are required for the test to be carried out. Second, all datasets used in the construction of the candidate models include observatory annual means up to at most 1993.5 and share similar links to our independent test data set. We, therefore, expect the test to be reasonably unbiased towards any ofthe models. The procedure has the inconvenience ofbeing sensitive to local crustal anomalies, as pointed out by Langel et al. (1982). Indeed, directly comparing predictions from the candidate models to the observed monthly means reveals little else than a common, correlated, hardly discriminating, disagreement mainly due to crustal anomalies. We repeated the comparison after correcting the monthly means for the crustal anomalies derived by Bloxham and Jackson (1992). This second test was much more significant and showed that the models do a comparable job, UB-95 being marginally better. We recommand equal weighing between the two GS-95 and IZ-95 candidate models, and a slightly larger weight for UB-95.</s0>
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<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="ENG"><s0>Earth</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="SPA"><s0>Planeta tierra</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Etats Unis</s0>
<s2>NG</s2>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>United States</s0>
<s2>NG</s2>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="SPA"><s0>Estados Unidos</s0>
<s2>NG</s2>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="2" l="FRE"><s0>Russie</s0>
<s2>NG</s2>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="ENG"><s0>Russian Federation</s0>
<s2>NG</s2>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="SPA"><s0>Rusia</s0>
<s2>NG</s2>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Royaume Uni</s0>
<s2>NG</s2>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>United Kingdom</s0>
<s2>NG</s2>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Reino Unido</s0>
<s2>NG</s2>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Révision</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>revision</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="2" l="SPA"><s0>Revisión</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Champ géomagnétique</s0>
<s5>08</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>geomagnetic field</s0>
<s5>08</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Observatoire</s0>
<s5>09</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>observatories</s0>
<s5>09</s5>
</fC03>
<fC03 i1="07" i2="2" l="SPA"><s0>Observatorio</s0>
<s5>09</s5>
</fC03>
<fC03 i1="08" i2="2" l="FRE"><s0>Correction</s0>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="2" l="ENG"><s0>corrections</s0>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="2" l="SPA"><s0>Corrección</s0>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="2" l="FRE"><s0>Modèle</s0>
<s5>13</s5>
</fC03>
<fC03 i1="09" i2="2" l="ENG"><s0>models</s0>
<s5>13</s5>
</fC03>
<fC03 i1="09" i2="2" l="SPA"><s0>Modelo</s0>
<s5>13</s5>
</fC03>
<fC03 i1="10" i2="2" l="FRE"><s0>Anomalie</s0>
<s5>14</s5>
</fC03>
<fC03 i1="10" i2="2" l="ENG"><s0>anomalies</s0>
<s5>14</s5>
</fC03>
<fC03 i1="10" i2="2" l="SPA"><s0>Anomalía</s0>
<s5>14</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Variation séculaire</s0>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="2" l="ENG"><s0>secular variations</s0>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="2" l="SPA"><s0>Variación secular</s0>
<s5>16</s5>
</fC03>
<fC06><s0>ILS</s0>
<s0>TA</s0>
</fC06>
<fC07 i1="01" i2="2" l="FRE"><s0>Amérique du Nord</s0>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>North America</s0>
</fC07>
<fC07 i1="01" i2="2" l="SPA"><s0>America del norte</s0>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Eurasie</s0>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Eurasia</s0>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Eurasia</s0>
</fC07>
<fC07 i1="03" i2="2" l="FRE"><s0>Europe Ouest</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="2" l="ENG"><s0>Western Europe</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="2" l="SPA"><s0>Europa del Oeste</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="04" i2="2" l="FRE"><s0>Europe</s0>
</fC07>
<fC07 i1="04" i2="2" l="ENG"><s0>Europe</s0>
</fC07>
<fC07 i1="04" i2="2" l="SPA"><s0>Europa</s0>
</fC07>
<fN21><s1>244</s1>
</fN21>
</pA>
</standard>
<server><NO>PASCAL 97-0406882 INIST</NO>
<ET>Candidate models for the 1995 revision of IGRF, a worldwide evaluation based on observatory monthly means</ET>
<AU>COHEN (Y.); ALEXANDRESCU (M.); HULOT (G.); LE MOUËL (J. L.); BARTON (C. E.); BARRACLOUGH (D. R.); QUINN (J. M.)</AU>
<AF>Laboratoire de Géomagnétisme, URA 729 CNRS, Institut de Physique du Globe de Paris, 4 Place Jussieu/75252 Paris/France (1 aut., 2 aut., 3 aut., 4 aut.); Australian Geological Survey Organisation/Canberra ACT 2601/Australie (1 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of geomagnetism and geoelectricity; ISSN 0022-1392; Coden JGEGAB; Japon; Da. 1997; Vol. 49; No. 2-3; Pp. 279-290; Bibl. 16 ref.</SO>
<LA>Anglais</LA>
<EA>Three candidate models for the IGRF 1995 description of the 1995.0 main field are evaluated. These are GS-95 proposed by the Goddard Space Flight Center (U.S.A.), IZ-95 proposed by IZMIRAN (Russia) and UB-95 proposed jointly by the US Navy (U.S.A.) and the British Geological Survey (U.K.). These models are tested against a set of December 1994 and January 1995 preliminary monthly mean values kindly provided to us by 73 observatories distributed throughout the world. This procedure has at least two advantages. First, no secular variation corrections are required for the test to be carried out. Second, all datasets used in the construction of the candidate models include observatory annual means up to at most 1993.5 and share similar links to our independent test data set. We, therefore, expect the test to be reasonably unbiased towards any ofthe models. The procedure has the inconvenience ofbeing sensitive to local crustal anomalies, as pointed out by Langel et al. (1982). Indeed, directly comparing predictions from the candidate models to the observed monthly means reveals little else than a common, correlated, hardly discriminating, disagreement mainly due to crustal anomalies. We repeated the comparison after correcting the monthly means for the crustal anomalies derived by Bloxham and Jackson (1992). This second test was much more significant and showed that the models do a comparable job, UB-95 being marginally better. We recommand equal weighing between the two GS-95 and IZ-95 candidate models, and a slightly larger weight for UB-95.</EA>
<CC>225B01; 001E01M01</CC>
<FD>Planète Terre; Etats Unis; Russie; Royaume Uni; Révision; Champ géomagnétique; Observatoire; Correction; Modèle; Anomalie; Variation séculaire</FD>
<FG>Amérique du Nord; Eurasie; Europe Ouest; Europe</FG>
<ED>Earth; United States; Russian Federation; United Kingdom; revision; geomagnetic field; observatories; corrections; models; anomalies; secular variations</ED>
<EG>North America; Eurasia; Western Europe; Europe</EG>
<SD>Planeta tierra; Estados Unidos; Rusia; Reino Unido; Revisión; Observatorio; Corrección; Modelo; Anomalía; Variación secular</SD>
<LO>INIST-2774.354000065743140080</LO>
<ID>97-0406882</ID>
</server>
</inist>
</record>

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Candidate models for the 1995 revision of IGRF, a worldwide evaluation based on observatory monthly means

Candidate models for the 1995 revision of IGRF, a worldwide evaluation based on observatory monthly means

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