%0 Journal Article %T Magnetospheric line radiation event observed simultaneously on board Cluster 1, Cluster 2 and DEMETER spacecraft %+ Faculty of Mathematics and Physics [Praha/Prague] %+ Institute of Atmospheric Physics [Prague] (IAP) %+ Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) %+ Department of Physics and Astronomy [Ames, Iowa] %A Němec, F %A Santolík, O %A Parrot, Michel %A Pickett, J.S. %Z GACR grant P209/12/P658,MSMT grant ME09107 and GACR grant 205/09/1253. This work was supported at Iowa by NASA Goddard Space Flight Canter grant NNX11AB38G. %< avec comité de lecture %@ 0094-8276 %J Geophysical Research Letters %I American Geophysical Union %V 39 %P L18103 (5 pages) %8 2012-07-13 %D 2012 %R 10.1029/2012GL053132 %Z Sciences of the Universe [physics]Journal articles %X [1] We present a case study of a magnetospheric line radiation (MLR) event observed simultaneously by Cluster 1 and Cluster 2 during a perigee passage at a radial distance of about 4 R E and, at the same time, by the low-orbiting DEMETER satellite. This unique constellation enables us to analyze spatiotemporal variability of the phenomenon. Although the Cluster spacecraft are separated by as much as 0.7 L-shells, the observed wave pattern is the same on both. The analysis of B to E ratios indicates a quasiparallel propagation, which suggests that the waves cross the geo-magnetic equator over a significant range of L-shells, at least 3.9–4.6. Simultaneous observations by the DEMETER satellite separated by about 1.8 hours in MLT from the Cluster spacecraft indicate a significant azimuthal extent of the source. The obtained results show that during the MLR event the same wave pattern is observed over a significant portion of the inner magnetosphere. Citation: Němec, F., O. Santolík, M. Parrot, and J. S. Pickett (2012), Magnetospheric line radiation event observed simultaneously on board Cluster 1, Cluster 2 and DEMETER spacecraft, Geophys. %G English %2 https://insu.hal.science/insu-01179811/document %2 https://insu.hal.science/insu-01179811/file/N_mec_et_al-2012-Geophysical_Research_Letters.pdf %L insu-01179811 %U https://insu.hal.science/insu-01179811 %~ OBSPM %~ INSU %~ CNRS %~ UNIV-ORLEANS %~ CNES %~ OSUC %~ LPC2E %~ PSL %~ OBSPM-PSL