Аннотации:
Рассмотрена и исследована динамика заряженных частиц при их серфинге на электромагнитных волнах в космической плазме. С помощью
численных расчетов рассмотрены траектории заряженных частиц на фазовой плоскости, захват частиц волной в эффективную потенциальную яму с
последующим сильно релятивистским ускорением. Учитывалось возможное циклотронное вращение частиц до их захвата волной. Установлено, что
на фазовой плоскости траектория захваченных частиц имеет особую точку
типа устойчивый фокус, а поведение траектории соответствует движению в
достаточно сложном нелинейном, нестационарном эффективном потенциале. Получены асимптотики основных характеристик ускоренных частиц.
Указана причина возникновения наблюдаемых вариаций потоков космических лучей с реализацией механизма серфотронного ускорения частиц
электромагнитными волнами в сравнительно спокойной космической
плазме. The research of dynamics of the capture and subsequent surfatron acceleration of electrons by electromagnetic
waves, propagating perpendicular to the magnetic field in cosmic plasma is conducted on
the basis of nonlinear numerical calculations. The optimal conditions for the realization of ultrarelativistic
electron acceleration by wave packets in cosmic plasma including favorable initial phase of
the wave on the particle trajectory, the sign of electron initial impulse in the direction of the wave front,
the magnitude of the phase velocity of the wave are formulated. The asymptotic behavior of the electron
characteristics under hard acceleration (relativistic factor, the impulse components and the captured particle
velocity, position of the bottom of the effective potential well, etc.) is obtained. It is shown that the
trajectories have the form of a spiral on the phase plane for trapped electrons and gradually approach the
singular point of the type of stable focus. The bottom position of effective non-stationary potential well
for the trapped electrons is different because it depends on the charge sign of the accelerated particle.
For trapped electrons the wave phase graphics on the particle trajectory correspond to oscillations with
an increasing period and decreasing amplitude with the increase of energy of the particle. The bottom of
an effective non-stationary potential well is achieved by trapped particle asymptotically. Thus, the
trapped electrons with different initial wave phases in their trajectory are gradually condensed on the
bottom of the effective non-stationary potential well.
It is important to emphasize that the packets of electromagnetic waves in the vicinity of relatively
quiet stars (like the Sun) can be local sources of additional acceleration of the spectrum of cosmic rays
with initial energies of the order of GeV up to the energies of hundreds of GeV and a dozen of TeV,
which provides the observed variation of the spectrum of cosmic rays in this area depending on the
space weather. Much more additional acceleration of cosmic rays can be in the plasma of local interstellar
clouds at distances from the Sun of about parsecs.
The analysis of surfatron generation mechanism of relativistic particles charged with electromagnetic
waves in the relatively tranquil cosmic plasma is important for understanding the causes of the observed
variability of the energy spectra of cosmic rays and the appearance of various features in their
energy spectrum. This allows giving a correct interpretation of the experimental data. It is important to
note that the flows of cosmic rays can significantly affect the vertical profiles of atmospheric temperature,
precipitation, and the dynamics of large-scale tropical cyclogenesis.
Описание:
Г.С. Мкртичян,
Российский университет дружбы народов, г. Москва, Российская Федерация
E-mail: hay-13@mail.ru. G.S. Mkrtichyan
People’s Friendship University of Russia, Moscow, Russian Federation
E-mail: hay-13@mail.ru