Magnetic Energy Storage and the Nightside Magnetosphere–Ionosphere Coupling
نویسندگان
چکیده
The change in the magnetic energy stored in the Earth’s magnetotail as a function of the solar wind IMF conditions are investigated using an empirical magnetic field model. The results are used to calculate the two normal modes contained in the low-dimensional global model called WINDMI for the solar wind driven magnetosphere–ionosphere system. The coupling of the magnetosphere–ionosphere (MI) through the nightside region 1 current loop transfers power to the ionosphere through two modes: a fast (period of minutes) oscillation and a slow (period of one hour) geotail cavity mode. The solar wind drives both modes in the substorm dynamics.
منابع مشابه
Solar Terrestrial Coupling Through Space Plasma Processes
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The project investigates plasma processes that govern the interaction between the solar wind, charged particles ejected from the sun, and the earth’s magnetosphere, the region above the ionosphere governed by the terrestrial magnetic field. Primary ...
متن کاملThe magnetosphere–ionosphere system from the perspective of plasma circulation: A tutorial
This tutorial review examines the role of O in the dynamics of magnetosphere–ionosphere coupling. The life cycle of an O plasma element is considered as it circulates from the midto high-latitude ionosphere. Energization and diversion of the convecting plasma element into outflows involves Alfvénic turbulence at the low-altitude base of the cusp and plasmasheet boundary layer and in downward-cu...
متن کاملUltra-low-frequency electrodynamics of the magnetosphere-ionosphere interaction
[1] The results presented in this paper provide an explanation for electromagnetic oscillations with frequencies much less than the fundamental eigenfrequency of the magnetosphere measured in the regions where the ionospheric conductivity is low and a small-amplitude, large-scale electric field in the ionosphere exists. This study is based on numerical simulations of a reduced two-fluid MHD mod...
متن کاملMagnetosphere sawtooth oscillations induced by ionospheric outflow.
The sawtooth mode of convection of Earth's magnetosphere is a 2- to 4-hour planetary-scale oscillation powered by the solar wind-magnetosphere-ionosphere (SW-M-I) interaction. Using global simulations of geospace, we have shown that ionospheric O(+) outflows can generate sawtooth oscillations. As the outflowing ions fill the inner magnetosphere, their pressure distends the nightside magnetic fi...
متن کاملInductive magnetosphere–ionosphere coupling
Inductive coupling of a global magnetospheric model to a global ionospheric–thermospheric model is described. Existing schemes based on electrostatic coupling are valid for magnetospheric variability occurring on time scales of order 100 s or longer. The formulation developed here extends the validity of the coupling model to time scales of order 10 s, while retaining the physics of quasi-stati...
متن کامل