On the ionospheric coupling of auroral electric fields
作者： G. T. Marklund
关键词: Computational physics 、 Acceleration 、 Coupling (physics) 、 Ionosphere 、 Electric field 、 Voltage drop 、 Geodesy 、 Characteristic energy 、 Physics 、 Cluster (physics) 、 Electron
摘要: Abstract. The quasi-static coupling of high-altitude potential structures and electric fields to the ionosphere is discussed with particular focus on downward field-aligned current (FAC) region. Results are presented from a preliminary analysis selection field events observed by Cluster above acceleration degree here estimated as ratio between magnetic drop, ΔΦII, inferred characteristic energy upward ion (electron) beams for (downward) region perpendicular (to B) potential, ΔΦbot, calculated integrating across structure. For currents, can be expressed analytically, using linear current-voltage relation, outlined Weimer et al. (1985). This gives scale size dependent where coupled (decoupled) (below) critical size. relation highly non-linear which complicates understanding how works. this experimental study indicate that small-scale decoupled, similar in There are, however, exceptions rule illustrated results intense fields, correlated indicating perfect altitude.
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