Сибирский федеральный университет

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: PROBLEMS OF GEOCOSMOS; Saint-Petersburg; Saint-Petersburg

Год издания: 2016

Ключевые слова: magnetosphere, radial diffusion, energy diffusion, pitch angle diffusion, wave-particle interaction, Ring Current

Аннотация: The purpose of the work is a further development of three-dimensional models. Therefore, a non-stationary three-dimensional numerical model describing the evolution of the proton distribution function has been developed. The distribution of the ring current protons in the inner magnetosphere during a magnetic storm is studied. The temporal and spatial evolution of the proton phase space densities in the Earth's dipole field has been simulated by a threedimensional model with taking account the radial, pitch angle and energy diffusion. The loss terms are related to the charge exchange and wave-particle interactions. The suggested model is a three-dimensional model with an original description of the pitch angle diffusion, which includes an original definition of the energy diffusion coefficient and a source of the charged particles and contains some mathematical models of the pitch angle diffusion as particular cases. The simulation starts with a quiet time distribution. The model is tested by comparing the calculated proton fluxes with Polar/MICS measurement during the magnetic storm on 21 - 22 October 1999. The calculations with the non-stationary three-dimensional mathematical model have been executed for a full range of the pitch angles from 0° to 180° at distances L = 2.26 - 6.6 for the energy range of protons E = (85 - 95) keV during 20 hours and 30 minutes for a real magnetic storm. In particular, comparison of the model proton pitch angle distributions (L = 5, MLT = 2300, E = 90 keV) with the pitch angle distributions observed by Polar/MICS for E = (80 - 100) keV, L = 5, MLT = 22.9 - 23.2 has been made. A good agreement between the model pitch angle distributions of protons and the experimental data has been demonstrated. The tendency, that the pitch angle distribution is a pancake-like for the prestorm condition, while it becomes a butterfly-like in the storm main phase has been confirmed. The suggested model can be used for modeling of the charged particle distribution function in the magnetospheres of Jupiter and Saturn.

Номера страниц: 310-317

Издатель: ООО "Издательство ВВМ"

• Smolin S.V.

• РИНЦ (eLIBRARY.RU)