overlapping ion structures in the mid-altitude cusp under northward imf: signature of dual lobe reconnection?

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ID: 147964
2012
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Abstract
On some rare occasions, data from the Cluster Ion Spectrometer (CIS) in the mid-altitude cusp reveal overlapping ion populations under northward interplanetary magnetic field (IMF). While the poleward part of the cusp exhibits the expected reverse dispersion due to lobe reconnection, its equatorward part shows a second ion population at higher-energy that coexists with the low energy tail of the dispersion. This second population is either dispersionless or slightly dispersed with energies increasing with increasing latitudes, indicative of lobe reconnection as well. Our analysis of a case that occurred 3 September 2002 when the IMF stayed northward for more than two hours suggests that the second population comes from the opposite hemisphere and is very likely on newly-closed field lines. We interpret this overlap of cusp populations as a clear mid-altitude signature of re-closed magnetic field lines by double lobe reconnection (reconnection in both hemispheres) under northward IMF. This interpretation is supported by modelling performed with the Cooling model and an MHD model.
Reference Key
pitout2012annalesoverlapping Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;F. Pitout;C. P. Escoubet;M. G. G. T. Taylor;J. Berchem;A. P. Walsh
Journal journal of food measurement and characterization
Year 2012
DOI
10.5194/angeo-30-489-2012
URL
https://www.ann-geophys.net/30/489/2012/angeo-30-489-2012.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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