%0 Journal Article %T Generation of downshifted oscillations in the electron foreshock: A loss-cone instability %+ Laboratoire de physique et chimie de l'environnement (LPCE) %+ Thales Research and Technology [Palaiseau] %+ The University of Sydney %+ Imperial College London %+ Mullard Space Science Laboratory (MSSL) %A Lobzin, V. %A Krasnoselskikh, Vladimir %A Schwartz, S. %A Cairns, Iver %A Lefebvre, B. %A Décréau, Pierrette %A Fazakerley, A. %< avec comité de lecture %@ 0094-8276 %J Geophysical Research Letters %I American Geophysical Union %V 32 %N 18 %P L18101 %8 2005 %D 2005 %R 10.1029/2005GL023563 %Z Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]Journal articles %X Measurements performed aboard Cluster spacecraft near Earth's bow shock on 24 January 2001 provide convincing evidence of a loss-cone feature within the electron foreshock region. This feature is formed by suprathermal electrons with energies 15 - 45 eV and pitch angles 130 degrees - 150 degrees and is always accompanied by electrostatic waves with frequencies well below the local plasma frequency. An instability analysis shows that these downshifted oscillations can result from a loss-cone instability of electron cyclotron modes rather than from the beam instability as previously suggested. %G English %2 https://insu.hal.science/insu-02873854/document %2 https://insu.hal.science/insu-02873854/file/2005GL023563.pdf %L insu-02873854 %U https://insu.hal.science/insu-02873854 %~ INSU %~ CNRS %~ UNIV-ORLEANS %~ OSUC %~ LPC2E %~ TEST3-HALCNRS