2025/09/30 by Tiberiu Harko, Harko, Tiberiu, Gabriela Raluca Mocanu +1
Economics, Econometrics and Finance · Mathematics · #Chaotic Dynamics (nlin.CD) #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Mathematical Physics (math-ph) #Spectral Theory in Mathematical Physics #Stochastic processes and financial applications #advanced mathematical theories
paper · doi:10.48550/arxiv.2509.25888
openalex publication_date 2025/09/30 · openalex created_date 2025/10/19 · openalex updated_date 2026/07/28
We consider a generalization of the classical nonrelativistic Störmer problem, describing the motion of charged particles in a purely magnetic dipole field, by taking into account the effects of the dissipation, assumed to be of friction type, proportional to the velocity of the particle, and of the presence of stochastic forces. In the presence of dissipative/stochastic effects, the motion of the particle in the magnetic dipole field can be described by a generalized Langevin type equation, which generalizes the standard Lorentz force equation. We perform a detailed numerical analysis of the dynamical behavior of the particles in a magnetic dipolar field in the presence of dissipative and stochastic forces, as well as of the electromagnetic radiation patterns emitted during the motion. The effects of the dissipation coefficient and of the stochastic force on the particle motion and on the emitted electromagnetic power are investigated, and thus a full description of the spectrum of the magnetic dipole type electromagnetic radiation and of the physical properties of the motion is also obtained. The power spectral density of the emitted electromagnetic power is also obtained for each case, and, for all considered Störmer type models, it shows the presence of peaks in the radiation spectrum, corresponding to certain intervals of the frequency.