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Kinetic aspects of foreshock cavities
Author(s) -
Schwartz Steven J.,
Sibeck David,
Wilber Mark,
Meziane Karim,
Horbury Timothy S.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025612
Subject(s) - foreshock , physics , geophysics , bow shock (aerodynamics) , interplanetary magnetic field , solar wind , shock (circulatory) , kinetic energy , interplanetary spaceflight , magnetosphere , magnetic field , computational physics , shock wave , mechanics , geology , seismology , classical mechanics , aftershock , medicine , quantum mechanics
We have investigated the kinetic signatures within, and at the edges of, a foreshock cavity. Such cavities are believed to be formed when an isolated collection of interplanetary magnetic field lines connect to quasi‐parallel regions of the Earth's bow shock, allowing energetic ions to flow upstream and excavate a local cavity. Observations by the Cluster spacecraft show precisely this configuration. The suprathermal ions can be seen just outside the edges of the cavity within a restricted range of gyrophases, consistent with their gyromotion tangential to the layer containing the cavity. Foreshock cavities, if sufficiently common, may play significant roles in triggering magnetospheric events. Thus our confirmation of their relatively simple formation mechanism lends support to their inferred frequency.