Probing discrete auroral arcs by ionospheric tomography
نویسندگان
چکیده
منابع مشابه
Discrete Auroral Arcs and Nonlinear Dispersive Field Line Resonances
Dispersive effects in field line resonances (FLRs) are discussed in the context of potential structures, parallel currents, and auroral density cavities observed by the FAST satellite. Our model includes the Earth’s dipole magnetic field, and accounts for electron inertia, electron thermal pressure, finite ion gyroradius effects, and field aligned variations of the plasma density and ambient el...
متن کاملTemporal and spatial evolution of discrete auroral arcs as seen by Cluster
Two event studies are presented in this paper where intense convergent electric fields, with mapped intensities up to 1350 mV/m, are measured in the auroral upward current region by the Cluster spacecraft, at altitudes between 3 and 5 Earth radii. Both events are from May 2003, Southern Hemisphere, with equatorward crossings by the Cluster spacecraft of the pre-midnight auroral oval. Event 1 oc...
متن کاملLuminosity variations in several parallel auroral arcs before auroral breakup
Variation of the luminosity in two parallel auroral arcs before auroral breakup has been studied by using digitised TV-data with high temporal and spatial resolution. The intervals when a new arc appears near already existing one were chosen for analysis. It is shown, for all cases, that the appearance of a new arc is accompanied by fading or disappearance of another arc. We have named these ev...
متن کاملIonospheric Models including the Auroral Environment
Modelling of the ionospheric-plasmaspheric electrondensity height profile N(h), as well as other parameters like the ion composition or electron and ion temperatures, over the whole altitude range for all geographical positions, time spans, and geophysical conditions is an essential part of ionospheric physics and a critical element in the development of practical schemes for ionospheric space ...
متن کاملInfluence of the Ionosphere on the Altitude of Discrete Auroral Arcs
The altitude of auroral arcs has long been a subject of auroral research. During the spring of 1960, we measured the altitude of the maximum luminosity of single, discrete auroral arcs by photometric triangulation from College and Fort Yukon. We found a change in altitude during twilight and puzzled over it for about two years, then forgot it. The dismissal of this conundrum led to skewed inter...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 1998
ISSN: 0992-7689
DOI: 10.1007/s005850050627