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dc.description.abstractOn 6 January 1998 an interplanetary shock hit the magnetosphere around 14:15 UT and caused a reconfiguration of the northern high-latitude ionospheric convection. We use SuperDARN, spacecraft and ground magnetometer data to study such reconfiguration. We find that the shock front was tilted towards the morning flank of the magnetosphere, while the Interplanetary Magnetic Field (IMF) was By-dominated, with By<0, IMF Bz>0 and |By|>>Bz. As expected, the magnetospheric compression started at the first impact point of the shock on the magnetopause causing an increase of the Chapman-Ferraro current from dawn to dusk and yielding an increase of the geomagnetic field at the geostationary orbit and on the ground. Moreover, the high-latitude magnetometer data show vortical structures clearly related to the interaction of the shock with the magnetosphere-ionosphere system. In this context, the SuperDARN convection maps show that at very high latitudes above the northern Cusp and in the morning sector, intense sunward convection fluxes appear, well correlated in time with the SI arrival, having a signature typical for Bz>0 dominated lobe reconnection. We suggest that in this case the dynamic pressure increase associated to the shock plays a role in favouring the setting up of a new lobe merging line albeit |By|>>Bz>0.en_US
dc.relation.ispartofAnnales Geophysicaeen_US
dc.relation.ispartofseries/26 (2008)en_US
dc.rightsCC0 1.0 Universal*
dc.titleThe effects of an interplanetary shock on the high-latitude ionospheric convection during an IMF By-dominated perioden_US
dc.description.pagenumber2937– 2951en_US
dc.description.obiettivoSpecifico2A. Fisica dell'alta atmosferaen_US
dc.description.journalTypeJCR Journalen_US
dc.contributor.authorCoco, Igino-
dc.contributor.authorAmata, E.-
dc.contributor.authorMarcucci, M. F.-
dc.contributor.authorAmbrosino, D.-
dc.contributor.authorVillain, J. P.-
dc.contributor.authorHanuise, C.-
item.fulltextWith Fulltext-
item.grantfulltextopen- di Fisica dello Spazio Interplanetario I.N.A.F., Via del fosso del cavaliere 100, 00133 Rome, Italy-, Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia- Nazionale di Geofisica e Vulcanologia-
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