Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10684
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dc.date.accessioned2018-02-15T07:16:54Zen
dc.date.available2018-02-15T07:16:54Zen
dc.date.issued2005en
dc.identifier.urihttp://hdl.handle.net/2122/10684en
dc.description.abstractIn this work we perform a statistical analysis of the ionospheric echo response observed by six radars of the SuperDARN network in the Northern Hemisphere, over 236 Sudden Impulses (SI) of solar wind dynamic pressure events (from 1997 through 2000). For that purpose, we make use of MRS, the Mean Rate of Scattering, as a function of time during the SI event. We classify the events in sudden increases (I events, 144 cases) and decreases (D events, 92 cases) of the solar wind dynamic pressure. Moreover, we make use of the AE index to define two distinct conditions of the ionosphere under which each event may take place: Quiet and Disturbed. Regarding Quiet conditions, for both I and D events, we find that MRS displays an increase related to the SI time. On the contrary, for Disturbed conditions, D events display an increase in MRS, while I events show a clear dip. The similarity of response for I and D events under Quiet conditions is briefly discussed, but the smaller number of D events does not allow one to further analyse them. As for the I events, a latitudinal analysis shows that the MRS increase for Quiet conditions is seen both at low latitudes (60 −70 3) and at high latitudes (70 −80 3); for Disturbed Is the MRS decrease is stronger at high latitudes. We suggest that the MRS increase for Quiet Is can be due to two different mechanisms: 1) a soft electron precipitation induced by Field Line Resonances (FLR) or loss cone instability at lower latitudes; 2) an enlargement of the cusp at higher latitudes, which in turn may induce enhanced particle precipitation. For what concerns Disturbed Is, the MRS decrease can be produced by a higher energy electron precipitation (>1 keV), that enhances the electron density in the E and D regions. This provokes a strong absorbtion of the radio waves in the D region and a higher refraction in the E region, leading to a decrease in MRS, especially at higher latitudes.en
dc.language.isoEnglishen
dc.relation.ispartofAnnales Geophysicaeen
dc.relation.ispartofseries/23 (2005)en
dc.rightsCC0 1.0 Universalen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.titleEffects on SuperDARN HF radar echoes of sudden impulses of solar wind dynamic pressureen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber1771– 1783en
dc.description.obiettivoSpecifico2A. Fisica dell'alta atmosferaen
dc.description.journalTypeJCR Journalen
dc.contributor.authorCoco, Iginoen
dc.contributor.authorAmata, E.en
dc.contributor.authorMarcucci, M. F.en
dc.contributor.authorDe Laurentis, M.en
dc.contributor.authorVillain, J. P.en
dc.contributor.authorHanuise, C.en
dc.contributor.authorCandidi, M.en
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto di Fisica dello Spazio Interplanetario I.N.A.F., Via del fosso del cavaliere 100, 00133 Rome, Italy-
crisitem.author.deptUniversità "Sapienza" di Roma-
crisitem.author.deptDipartimento di Fisica, Università dell'Aquila, Italy-
crisitem.author.deptCentre Nationale de la Recherche Scientifique – Laboratoire de Physique et Chimie de l’Environnement, Orleans, France-
crisitem.author.deptIFSI/CNR, Roma, Italy-
crisitem.author.orcid0000-0003-4070-6828-
crisitem.author.orcid0000-0002-5002-6060-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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