Effect of Long-Wavelength Magnetic Field Disturbances on the Generation of Auroral Kilometric Radiation
- Авторы: Burinskaya T.1,2, Shevelev M.1
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Учреждения:
- Space Research Institute
- National Research University Higher School of Economics
- Выпуск: Том 44, № 11 (2018)
- Страницы: 1026-1032
- Раздел: Space Plasma
- URL: https://journals.rcsi.science/1063-780X/article/view/186981
- DOI: https://doi.org/10.1134/S1063780X1811003X
- ID: 186981
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Аннотация
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.
Об авторах
T. Burinskaya
Space Research Institute; National Research University Higher School of Economics
Автор, ответственный за переписку.
Email: tburinsk@iki.rssi.ru
Россия, Moscow, 117997; Moscow, 101000
M. Shevelev
Space Research Institute
Email: tburinsk@iki.rssi.ru
Россия, Moscow, 117997