Variations of low-latitude geomagnetic fields and Dst index caused by magnetospheric substorms

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dc.contributor.authorHuang, Chao-Song
dc.contributor.authorFoster, J. C.
dc.contributor.authorGoncharenko, L. P.
dc.contributor.authorReeves, G. D.
dc.contributor.authorChau Chong Shing, Jorge Luis
dc.contributor.authorYumoto, K.
dc.contributor.authorKitamura, K.
dc.date.accessioned2018-06-26T11:44:56Z
dc.date.available2018-06-26T11:44:56Z
dc.date.issued2004-05-25
dc.description.abstractWe present observations of periodic magnetospheric substorms and corresponding ionospheric disturbances. Since the periodic substorms occur during a stable interplanetary magnetic field, we are able to identify which ionospheric signatures are caused solely by substorms. We find that the low-latitude ionospheric electric field perturbation after substorm onsets is eastward on the dayside and westward on the nightside and that the ground magnetometer northward (H) deviations at middle and low latitudes show an increase (a positive bay) after each substorm onset, no matter whether the magnetometers are located on the dayside or on the nightside. The nightside magnetometer H deviations are closely correlated with the inner magnetospheric magnetic field Bz component during the dipolarization process. The Dst index shows a significant increase of 20–40 nT after each substorm onset. We propose that the increase in the magnetometer H field and Dst index in response to substorm onsets is related to the field dipolarization. In this scenario the nightside magnetosphere earthward of the near-Earth neutral line is highly compressed during the dipolarization, and the magnetic flux density within the inner magnetosphere is greatly enhanced, resulting in an increase in the ground magnetometer H component and in Dst.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationHuang, C., Foster, J. C., Goncharenko, L. P., Reeves, G. D., Chau, J. L., Yumoto, K., & Kitamura, K. (2004). Variations of low-latitude geomagnetic fields and Dst index caused by magnetospheric substorms.==$Journal of Geophysical Research: Space Physics, 109$==(A5), A05219. https://doi.org/10.1029/2003JA010334es_ES
dc.identifier.doihttps://doi.org/10.1029/2003JA010334es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Geophysical Research: Space Physicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/1531
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:2169-9380
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectMagnetic stormses_ES
dc.subjectSubstormses_ES
dc.subjectDipolarizationes_ES
dc.subjectGeomagnetic disturbanceses_ES
dc.subjectIonospheric electric fieldes_ES
dc.subjectDst indexes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleVariations of low-latitude geomagnetic fields and Dst index caused by magnetospheric substormses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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