Recent news
Magnetosphere formation in the 3D kinetic approach by solar wind plasma flow characterized by shape of the particle distribution function. The new parameters of interaction and new spatial scalings
- Institute of Applied Physics RAS, Russia
The classic problem of the magnetosphere "outer" part formation by the
solar wind plasma flow, including the forward effect, magnetotail
formation, and the backward effect, dipolization, was considerd in the 3D
large scale kinetic approximation via a self-consistent solutions of
Vlasov/Maxwell equations. The "inner" magnetosphere is a specified source
of distributed magnetization with magnetodipole and toroidal moments. The
specified external flow of hot collisionless plasma, solar wind (SW,) is
characterized by particle velocity distribution function (PDF) with
different shapes. In the Chapman approach the SW flow is nonmagnetized
plasma and formation of the magnetosphere is associated with the
excitation of inductive electromagnetic fields (e.m.f) via the Cherenkov
wide band resonance of magnetization source fields with flow particles in
opacity and absorption mode. The magnetization source fields are screened
by resistive and diamagnetic currents. We distinguish the resistive scale
of anomalous screening associated with the process of particle
acceleration by inductive electric fields, which provides dissipation and
the effect of magnetic reconnection. We also get diamagnetic scale,
associated with magnetic field effect on particles. The ratio of
diamagnetic and resistive currents in the magnetosphere is characterized
by the introduced G parameter which we call "the e.m. quality of the flow
". The value G depends on the shape of the PDF in the incoming SW plasma
flow only. The e.m. quality value G determines the e.m. "space weather" in
SW and magnetosphere transfer to dipolization state and vice-versa with a
magnetotail. Note that acoustic Mach number characterizes the SW
compressibility and the shock wave formation effect only. In the Dangey
approach, the flow is magnetized by the "governing" magnetic (GM) field.
The 3D kinetic approach is much more complicated, the plasma is MHD
transparent in the wide band, that leads to e.m. radiation field formation
in the magnetosphere distributed in the Alvenic cone due to the dispersion
effects. The radiation free process of magnetotail formation and
magnetosphere dipolization is associated with the effect of "narrow band
ion-cyclotron anomalous screening of circular e.m.f". These e.m.f.
constitute the magnetization source spectrum. New scales and dimensionless
parameters were obtained for this process, they are defined via GM field
(http://www.vniitf.ru/images/zst/2012/s3/3-13.pdf).