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Effect of Long-Wavelength Magnetic Field Disturbances on the Generation of Auroral Kilometric Radiation
- Source :
- Plasma Physics Reports. 44:1026-1032
- Publication Year :
- 2018
- Publisher :
- Pleiades Publishing Ltd, 2018.
-
Abstract
- The effect of long-wavelength magnetic field disturbances typical of the Earth’s auroral region on the generation of auroral kilometric radiation in a narrow three-dimensional plasma cavity in which a weakly relativistic electron flow propagates against the background of cold low-density plasma is analyzed. The dynamics of the propagation and amplification of fluctuation waves with initial group velocities directed toward the higher magnetic field is considered in the geometrical optics approximation. Analysis of wave trajectories shows that the wave amplification coefficients depend on the magnetic field gradient in the reflection region. If the wave reflection point lies in the region where the gradient of the disturbed magnetic field is less than that of the undisturbed dipole field, then the wave amplification coefficients exceed those of waves propagating in the undisturbed field, and vice versa. Thus, the shape of the spectrum of generated waves changes in the presence of long-wavelength disturbances of the dipole magnetic field in such a way that segments with different curvatures can form in the spectrum.
- Subjects :
- Physics
Physics and Astronomy (miscellaneous)
Field (physics)
Geometrical optics
Auroral kilometric radiation
Plasma
Condensed Matter Physics
01 natural sciences
Computational physics
Magnetic field
Dipole
Physics::Space Physics
0103 physical sciences
Reflection (physics)
010306 general physics
010303 astronomy & astrophysics
Magnetic dipole
Subjects
Details
- ISSN :
- 15626938 and 1063780X
- Volume :
- 44
- Database :
- OpenAIRE
- Journal :
- Plasma Physics Reports
- Accession number :
- edsair.doi...........8579a777f676755c51c2b96774d82601