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1. Identity statement
Reference TypeConference Paper (Conference Proceedings)
Sitemtc-m21c.sid.inpe.br
Holder Codeisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Identifier8JMKD3MGP3W34R/3SB3FF5
Repositorysid.inpe.br/mtc-m21c/2018/12.03.12.59
Last Update2021:03.01.15.32.37 (UTC) simone
Metadata Repositorysid.inpe.br/mtc-m21c/2018/12.03.12.59.46
Metadata Last Update2021:03.01.15.32.37 (UTC) simone
Secondary KeyINPE--PRE/
Citation KeyEspinosaSarmientoPadiAlve:2018:EsGeIn
TitleEstimation of geomagnetically Induced Currents at Low Latitude and Equatorial regions of Brazil during two great magnetic storms of 2015
Year2018
Access Date2024, May 18
Secondary TypePRE CI
Number of Files1
Size68 KiB
2. Context
Author1 Espinosa Sarmiento, Karen Viviana
2 Padilha, Antônio Lopes
3 Alves, Livia Ribeiro
Resume Identifier1
2 8JMKD3MGP5W/3C9JGJG
Group1 DIDGE-CGCEA-INPE-MCTIC-GOV-BR
2 DIDGE-CGCEA-INPE-MCTIC-GOV-BR
3 DIDGE-CGCEA-INPE-MCTIC-GOV-BR
Affiliation1 Instituto Nacional de Pesquisas Espaciais (INPE)
2 Instituto Nacional de Pesquisas Espaciais (INPE)
3 Instituto Nacional de Pesquisas Espaciais (INPE)
Author e-Mail Address1 karen.sarmiento@inpe.br
2 antonio.padilha@inpe.br
3 livia.alves@inpe.br
Conference NameAGU Fall Meeting
Conference LocationWashington, D. C.
Date10-14 dec.
History (UTC)2018-12-03 12:59:46 :: simone -> administrator ::
2019-01-14 17:06:39 :: administrator -> simone :: 2018
3. Content and structure
Is the master or a copy?is the master
Content Stagecompleted
Transferable1
Content TypeExternal Contribution
AbstractThe South American longitudinal sector presents the unique feature of the presence of daytime equatorial electrojet currents (EEJ) and the South Atlantic Magnetic Anomaly (SAMA), where the global minimum intensity of the geomagnetic field is observed. Enhanced amplitudes are observed in the horizontal magnetic components recorded on the ground within the areas of influence of both the EEJ and the SAMA and therefore it is expected that significant enhancements of GIC magnitude also occur in these regions. We use here geomagnetic field variations data recorded by fluxgate magnetometers from the Brazilian space weather program (EMBRACE) to evaluate GIC effects during two strong geomagnetic storms in March (Dst = −222nT) and June (Dst = −204nT) 2015. Among the available geomagnetic stations, we selected those with information about the underground electrical conductivity structure and that can be approximated by 1-D models for calculation of the geoelectric field. GIC levels are estimated using a realistic local power grid model located in the central region of Brazil, artificially moved to the sites where the geomagnetic measurements are available. Maximum GIC amplitude of about 8 A was estimated at an equatorial station positioned over high resistivity underground, associated with the arrival of an interplanetary pressure pulse just behind two other pulses during the June storm. The results are also interpreted in terms of the ionospheric currents over the measurement sites and the conductivity distribution beneath these sites. It is observed that both EEJ and SAMA increase the GIC amplitudes, with the greatest effects associated with EEJ. In relation to the underlying conductivity structure, the higher GIC effects are associated with low conductance at crustal depths, with upper mantle depths showing minor effect.
AreaCEA
Arrangementurlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDGE > Estimation of geomagnetically...
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4. Conditions of access and use
data URLhttp://urlib.net/ibi/8JMKD3MGP3W34R/3SB3FF5
zipped data URLhttp://urlib.net/zip/8JMKD3MGP3W34R/3SB3FF5
Languageen
Target Fileespinosa_estimation.pdf
User Groupsimone
Reader Groupadministrator
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Visibilityshown
Update Permissionnot transferred
5. Allied materials
Next Higher Units8JMKD3MGPCW/3EU29DP
Citing Item Listsid.inpe.br/mtc-m21/2012/07.13.14.40.26 5
Host Collectionurlib.net/www/2017/11.22.19.04
6. Notes
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