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dc.contributor.author Astafyeva, Elvira
dc.contributor.author Zakharenkova, Irina
dc.contributor.author Doornbos, Eelco
dc.date.accessioned 2018-11-19T09:54:06Z
dc.date.available 2018-11-19T09:54:06Z
dc.date.issued 2014-12-12
dc.identifier.citation Astafyeva, E., Zakharenkova, I., & Doornbos, E. (2014). Opposite hemispheric asymmetries during the ionospheric storm of 29-31 August 2004.==$Journal of Geophysical Research: Space Physics, 120$==(1), 697-714. https://doi.org/10.1002/2014JA020710 es_ES
dc.identifier.uri http://hdl.handle.net/20.500.12816/3692
dc.description.abstract By making use of multiple ground‐based and spaceborne instruments, we study ionospheric and thermospheric behavior during the moderately intense geomagnetic storm of 29–31 August 2004 (minimum Dst excursion of −128 nT). Although this storm was far from the strongest in solar cycle 23, it provoked quite interesting effects in the ionosphere, such as opposite hemispheric asymmetries in the ionospheric F layer and in the topside ionosphere and a development of the ionospheric superfountain effect in the postsunset sector. Data from ground‐based GPS receivers and ionosondes revealed large increase in total electron content (TEC) and in NmF2 in the southern hemisphere, whereas in the northern hemisphere, very weak or no effect was observed. On the contrary, the topside measurements indicated the occurrence of a positive storm in the northern hemisphere. Overall, the strongest storm time disturbances were observed in the postsunset sector (~20:30–21:30 LT), where satellite radar altimeters TOPEX and Jason 1, along with the CHAMP satellite showed ~250–400% TEC increase in the middle‐ and low‐latitude regions. The signatures of the ionospheric plasma enhancement were seen up to the height of the Defense Meteorological Satellite Program (DMSP) satellites (~840 km). As for the thermospheric storm, data of the Gravity Recovery and Climate Experiment (GRACE) satellite mission revealed no asymmetry in neutral density data in the evening sector (~17 UT); however, very strong hemispheric asymmetry was observed in the postsunset sector by CHAMP (~21 UT). Overall, neutral density increase in the postsunset sector was found to be much stronger than in the evening sector. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher American Geophysical Union es_ES
dc.relation.ispartof urn:issn:2169-9380
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.subject Ionospheric storm es_ES
dc.subject Hemispheric asymmetry es_ES
dc.subject Topside contribution es_ES
dc.subject Superfountain effect es_ES
dc.subject Thermospheric storm es_ES
dc.subject Postsunset sector es_ES
dc.title Opposite hemispheric asymmetries during the ionospheric storm of 29-31 August 2004 es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.01 es_ES
dc.identifier.journal Journal of Geophysical Research: Space Physics es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.1002/2014JA020710 es_ES

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