Abstract
The time evolution of the magnetic field aligned super-small-scale irregularities in the concentration of charged particles, existing in the near-Earth rarefied plasma, is studied with the help of the model simulation. A new version of the two-dimensional mathematical model, developed earlier in the Polar Geophysical Institute, is utilized to investigate the temporal history of the irregularity with circular cross section, created initially in the near-Earth plasma. The utilized model is based on a numerical solution of the Vlasov-Poisson system of equations, with the Vlasov equations describing the distribution functions of charged particles and the Poisson equation governing the self-consistent electric field. The results of simulation indicate that the mobility of the positive ions ought to influence essentially on the time evolution of the super-small-scale irregularities in the concentration of charged particles, existing in the near-Earth rarefied plasma.
Highlights
Irregularities in the concentration of charged particles are often observed in the near-Earth plasma
The purpose of the present paper is to investigate numerically the time evolution of the magnetic field aligned super-small-scale irregularities in the concentration of charged particles, existing in the near-Earth rarefied plasma, whose cross section is much less than the mean free path of particles between successive collisions and commensurable with a Debye length
For the first case, when positive ions were supposed to be immovable, the results are shown by solid line, whereas, for the second case, when positive ions can move, the results are shown by dashed line
Summary
Irregularities in the concentration of charged particles are often observed in the near-Earth plasma. These irregularities are a natural phenomenon in the Earth’s ionosphere and magnetosphere. (2015) Numerical Modeling of the Time Evolution of Super-Small-Scale Irregularities in the Near-Earth Rarefied Plasma. The well-known equatorial anomaly at F-layer altitudes is the example of large-scale irregularities [1]. Some types of large-scale irregularities are observed in the high-latitude ionosphere, for example, the tongue of increased values of the electron density stretched over the polar cap from the dayside to night side, polar and auroral peaks of ionization, “patches” and “blobs” of ionization and so on [3]-[6]. An example of irregularities in the ionosphere is meteor plasma trails, [14]
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