Structures in ionospheric number density and velocity associated with polar cap ionization patches
نویسندگان
چکیده
منابع مشابه
ESR mapping of polar-cap patches in the dark cusp
[1] We present the first ever measurement of the full thermal plasma properties, of an ionospheric patch in full darkness in the noon region where patches are believed to form. Further these data present the first experimental evidence for the Lockwood and Carlson class of mechanisms for forming patches by plasma injection. These data were possible only because of a new measurement capability w...
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Wemeasure the flux density, composition, and energy of outflowing ions above the polar cap, accelerated by quasi-static electric fields parallel to the magnetic field and associated with polar cap arcs, using Cluster. Mapping the spacecraft position to its ionospheric foot point, we analyze the dependence of these parameters on the solar zenith angle (SZA). We find a clear transition at SZA bet...
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[1] The polar cap index (PCI) has been shown to be quite useful as an index of the electrodynamic processes within the high-latitude ionosphere. Here we use between 150 and 180 magnetometers to model the high-latitude electrodynamics with the assimilative mapping of ionospheric electrodynamics (AMIE) technique for all of 1997–2001. We compare AMIE calculations of the cross polar cap potential (...
متن کاملVelocity of auroral arcs drifting equatorward from the polar cap
The drift velocity of an auroral arc is compared with the component of F-region plasma velocity in the same direction for ten cases where the arc is seen to move steadily equatorward for several minutes without any major change in appearance or orientation. In most cases the two velocities are close, but on two occasions the drift velocity of the arc is much higher than the plasma velocity. Fro...
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A new method to reconstruct the instantaneous convection pattern in the Earth's polar ionosphere is suggested. Plasma convection in the polar cap ionosphere is described as a hydrodynamic incompressible ̄ow. This description is valid in the region where the electric currents are ®eld aligned (and hence, the Lorentz body force vanishes). The problem becomes two-dimensional, and may be described ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 1997
ISSN: 0148-0227
DOI: 10.1029/96ja03141