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dc.contributor.author
Zossi, Bruno Santiago
dc.contributor.author
Fagre, Mariano
dc.contributor.author
Amit, Hagay
dc.contributor.author
Elias, Ana Georgina
dc.date.available
2020-08-27T13:37:38Z
dc.date.issued
2020-08
dc.identifier.citation
Zossi, Bruno Santiago; Fagre, Mariano; Amit, Hagay; Elias, Ana Georgina; Geomagnetic Field Model Indicates Shrinking Northern Auroral Oval; Blackwell Publishing Ltd; Journal of Geophysical Research: Space Physics; 125; 8; 8-2020
dc.identifier.issn
2169-9402
dc.identifier.uri
http://hdl.handle.net/11336/112526
dc.description.abstract
Polar cap and auroral oval areas are presented for the period 1900‐2015 using a model of the magnetosphere and the IGRF‐12 model for the geomagnetic field. The effect of the main field long‐term changes is addressed considering steady interplanetary conditions. Until ~1940 both northern and southern polar cap areas increased with time, consistent with the geomagnetic dipole moment decrease during this period. Thereafter, while the southern polar cap area continued to increase steadily, the northern polar cap area has been decreasing rapidly. This hemispherical dichotomy is related to asymmetry in the core field and its secular variation. In the southern polar region the surface field intensity has been decreasing throughout the entire period, whereas in the northern polar region an intensity decrease turned to an increase from 1940 to present day. This recent surface intensity increase stems from intensification of the flux patch below Siberia and cessation of weakening of the flux patch below North America, both on the core‐mantle boundary. The surprising temporal decrease in the area of the northern polar cap has important implications for space weather and communication systems. While the decreasing dipole intensity allows more particles to penetrate the atmosphere, a shrinking northern auroral oval implies an increase in particle precipitation density, resulting in more severe damage to airplanes and ships positioning systems, spacecraft electronic systems and airline passengers when passing above this region. Further study is needed to observationally establish that the northern auroral oval, as defined by optical occurrences of aurora, is indeed shrinking.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Blackwell Publishing Ltd
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
AURORAL OVAL AREA SECULAR VARIATION
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MAGNETIC FIELD SECULAR VARIATION
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POLAR CAP SECULAR VARIATION
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Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Geomagnetic Field Model Indicates Shrinking Northern Auroral Oval
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-08-19T19:32:21Z
dc.journal.volume
125
dc.journal.number
8
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Zossi, Bruno Santiago. Universidad Nacional de Tucumán. Instituto de Física del Noroeste Argentino. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet Noa Sur. Instituto de Física del Noroeste Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina
dc.description.fil
Fil: Fagre, Mariano. Universidad Nacional de Tucumán. Facultad de Cs. Exactas y Tecnología. Laboratorio de Telecomunicaciones; Argentina
dc.description.fil
Fil: Amit, Hagay. Universite de Nantes; Francia
dc.description.fil
Fil: Elias, Ana Georgina. Universidad Nacional de Tucumán. Instituto de Física del Noroeste Argentino. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet Noa Sur. Instituto de Física del Noroeste Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina
dc.journal.title
Journal of Geophysical Research: Space Physics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA027434
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1029/2019JA027434
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