Wavenumber space analysis of oscillations in weakly non-uniform magnetoplasmas

1973 ◽  
Vol 9 (2) ◽  
pp. 275-293 ◽  
Author(s):  
J. H. Brownell
Keyword(s):  
Magnetic Field ◽  
External Source ◽  
Low Density ◽  
Plasma System ◽  
Electrostatic Waves ◽  
Long Wavelength ◽  
Plasma Slab ◽  
Low Density Plasma ◽  
The Magnetic Field ◽  
Density Plasma

A differential equation in wavenumber space is used to find the electric field excited by an external source in a weakly non-uniform, low-β, neutral magneto- plasma slab (with B perpendicular to ∇n). The analysis is general enough to allow one to judge the accuracy of previously used long-wavelength methods. Electrostatic waves which propagate across the magnetic field parallel to the density gradient are considered, and the impedance of a grid-plasma system is determined. The calculation is specialized to the case of a low density plasma with applied frequencies near the upper hybrid.

scholarly journals Mode conversion in cold low-density plasma with a sheared magnetic field

2017 ◽  
Vol 24 (12) ◽  
pp. 122116 ◽  
Author(s):  
I. Y. Dodin ◽  
D. E. Ruiz ◽  
S. Kubo
Keyword(s):  
Magnetic Field ◽  
Mode Conversion ◽  
Low Density ◽  
Low Density Plasma ◽  
Density Plasma

scholarly journals Joint analysis of the magnetic field and Total Gradient Intensity in Central Europe

2019 ◽  
Author(s):  
Maurizio Milano ◽  
Maurizio Fedi ◽  
J. Derek Fairhead
Keyword(s):  
Magnetic Field ◽  
Central Europe ◽  
Joint Analysis ◽  
East European ◽  
Long Wavelength ◽  
Low Degree ◽  
Total Gradient ◽  
Synthetic Models ◽  
The Magnetic Field ◽  
Different Altitudes

Abstract. In the European region, the magnetic field at satellite altitudes (~ 350 km) is mainly defined by a long-wavelength magnetic-low called here the Central Europe Magnetic Low (CEML), located to the southwest of the Trans European Suture Zone (TESZ). We studied this area by a joint analysis of the magnetic and total gradient (∇T) anomaly maps, for a range of different altitudes of 5 km, 100 km and 350 km. Tests on synthetic models showed the usefulness of the joint analysis at various altitudes to identify reverse dipolar anomalies and to characterize areas in which magnetization is weak. By this way we identified areas where either reversely or normally magnetized sources are locally dominant. At a European scale these anomalies are sparse, with a low degree of coalescence effect. The ∇T map indeed presents generally small values within the CEML area, indicating that the Palaeozoic Platform is weakly magnetized. At 350 km altitude, the TESZ effect is largely dominant: with intense ∇T highs above the East European Craton (EEC) and very small values above the Palaeozoic Platform, this again denoting a weakly magnetized crust. Small coalescence effects are masked by the trend of the TESZ. Although we identified sparsely located reversely magnetized sources in the Palaeozoic Platform of the CEML, the joint analysis does not support a model of a generally reversely magnetized crust. Instead, our analysis strongly favors the hypothesis that the CEML anomaly is mainly caused by a sharp contrast between the magnetic properties of EEC and Palaeozoic Platform.

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