Takashi Kikuchi

TL;DR: In this paper, the problem of instantaneous transmission of the polar ionospheric electric field to the equator is solved analytically as an initial-boundary value problem by assuming a plane Earth-ionosphere waveguide system composed of the metallic ionosphere with vertical static magnetic field and the perfectly conducting Earth, the TM0 (zeroth-order transverse magnetic) waveguide mode excited by the polar electric field propagates instantaneously to the low-latitude accompanying the electric field with the same direction as the polar field.

TL;DR: A multihole thin-foil target is proposed in order to increase the energy-conversion efficiency from laser to protons and the multiholes transpiercing the foil target helps to enhance the laser-proton energy-Conversion efficiency significantly.

TL;DR: In this paper, the Laplace transform was used to examine whether the preliminary reverse impulse (PRI) of geomagnetic storm sudden commencement (SSC) is produced by the direct incidence of hydromagnetic waves on the ionosphere.

TL;DR: In this article, the acceleration of ions leaving a plasma layer with different density gradients, from a step-like overdense plasma to an underdense plasma with a smooth density gradient, was analyzed.

TL;DR: In this article, suppression of a transverse proton divergence is focused by using a controlled electron cloud, where an intense short pulse laser illuminates a foil plasma target, first electrons are accelerated and they form a strong electrostatic field at the target surface, then ions are accelerated by the strong field.