Equatorial ionospheric electric fields during the November 2004 magnetic storm

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dc.contributor.authorFejer, B. G.
dc.contributor.authorJensen, J. W.
dc.contributor.authorKikuchi, T.
dc.contributor.authorAbdu, M. A.
dc.contributor.authorChau Chong Shing, Jorge Luis
dc.date.accessioned2018-07-17T16:26:02Z
dc.date.available2018-07-17T16:26:02Z
dc.date.issued2007-10
dc.description.abstractWe use radar measurements from the Jicamarca Radio Observatory, magnetometer observations from the Pacific sector and ionosonde data from Brazil to study equatorial ionospheric electric fields during the November 2004 geomagnetic storm. Our data show very large eastward and westward daytime electrojet current perturbations with lifetimes of about an hour (indicative of undershielding and overshielding prompt penetration electric fields) in the Pacific equatorial region during the November 7 main phase of the storm, when the southward IMF, the solar wind and reconnection electric fields, and the polar cap potential drops had very large and nearly steady values. This result is inconsistent with the recent suggestion that solar wind electric fields penetrate without attenuation into the equatorial ionosphere for several hours during storm main phase. The largest daytime prompt penetration electric fields (about 3 mV/m) ever observed over Jicamarca occurred during the November 9 storm main phase, when large equatorial electrojet current and drift perturbations were also present in the Pacific and Brazilian equatorial regions. The rise and decay times of these equatorial electric fields were about 20 min longer than of the corresponding solar wind electric fields. The ratios of prompt penetration electric fields and corresponding solar wind electric field changes were highly variable even during the day, and had largest values near dawn. Also, the prompt penetration electric fields did not show polar cap potential drop saturation effects. Our results clearly highlight that the relationships of prompt penetration and solar wind electric fields, and polar cap potentials are far more complex than implied by simple proportionality factors.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationFejer, B. G., Jensen, J. W., Kikuchi, T., Abdu, M. A., & Chau, J. L. (2007). Equatorial ionospheric electric fields during the November 2004 magnetic storm.==$Journal of Geophysical Research: Space Physics, 112$==(A10), A10304. https://doi.org/10.1029/2007JA012376es_ES
dc.identifier.doihttps://doi.org/10.1029/2007JA012376es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Geophysical Research: Space Physicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/1908
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:2169-9380
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectDisturbance electric fieldses_ES
dc.subjectIonospheric storm effectses_ES
dc.subjectIonos plasma driftses_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleEquatorial ionospheric electric fields during the November 2004 magnetic stormes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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