Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model

For southward interplanetary magnetic field (IMF) during local summer, the hemispherically integrated Poynting flux estimated by FAST‐satellite‐derived empirical models is significantly larger for the northern hemisphere (NH) than for the southern hemisphere (SH). In order to test whether the differ...

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Autores principales: Cosgrove, Russell B., Bahcivan, Hasan, Chen, Steven, Sanchez, Ennio, Knipp, Delores
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9285675/
https://www.ncbi.nlm.nih.gov/pubmed/35860481
http://dx.doi.org/10.1029/2021GL097329
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author Cosgrove, Russell B.
Bahcivan, Hasan
Chen, Steven
Sanchez, Ennio
Knipp, Delores
author_facet Cosgrove, Russell B.
Bahcivan, Hasan
Chen, Steven
Sanchez, Ennio
Knipp, Delores
author_sort Cosgrove, Russell B.
collection PubMed
description For southward interplanetary magnetic field (IMF) during local summer, the hemispherically integrated Poynting flux estimated by FAST‐satellite‐derived empirical models is significantly larger for the northern hemisphere (NH) than for the southern hemisphere (SH). In order to test whether the difference is statistically significant, the model uncertainties have been estimated by dividing the data sets for each hemisphere into two nonintersecting sets, and separately constructing the model using each of the four sets. The model uncertainty appears to be smaller than the estimated asymmetry. The asymmetry is mostly absent when the IMF is northward, except there is some evidence that it may actually reverse during local winter. The phenomena is coupled with what appears to be a more distinct two‐cell convection pattern in the NH, and a possibly greater cusp contribution in the SH. All this suggests an effect of magnetosphere‐ionosphere‐thermosphere coupling, probably related to asymmetries in Earth's geomagnetic field.
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spelling pubmed-92856752022-07-18 Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model Cosgrove, Russell B. Bahcivan, Hasan Chen, Steven Sanchez, Ennio Knipp, Delores Geophys Res Lett Research Letter For southward interplanetary magnetic field (IMF) during local summer, the hemispherically integrated Poynting flux estimated by FAST‐satellite‐derived empirical models is significantly larger for the northern hemisphere (NH) than for the southern hemisphere (SH). In order to test whether the difference is statistically significant, the model uncertainties have been estimated by dividing the data sets for each hemisphere into two nonintersecting sets, and separately constructing the model using each of the four sets. The model uncertainty appears to be smaller than the estimated asymmetry. The asymmetry is mostly absent when the IMF is northward, except there is some evidence that it may actually reverse during local winter. The phenomena is coupled with what appears to be a more distinct two‐cell convection pattern in the NH, and a possibly greater cusp contribution in the SH. All this suggests an effect of magnetosphere‐ionosphere‐thermosphere coupling, probably related to asymmetries in Earth's geomagnetic field. John Wiley and Sons Inc. 2022-02-11 2022-02-28 /pmc/articles/PMC9285675/ /pubmed/35860481 http://dx.doi.org/10.1029/2021GL097329 Text en © 2022. The Authors. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Letter
Cosgrove, Russell B.
Bahcivan, Hasan
Chen, Steven
Sanchez, Ennio
Knipp, Delores
Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model
title Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model
title_full Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model
title_fullStr Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model
title_full_unstemmed Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model
title_short Violation of Hemispheric Symmetry in Integrated Poynting Flux via an Empirical Model
title_sort violation of hemispheric symmetry in integrated poynting flux via an empirical model
topic Research Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9285675/
https://www.ncbi.nlm.nih.gov/pubmed/35860481
http://dx.doi.org/10.1029/2021GL097329
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