A new stationary analytical model of the heliospheric current sheetстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 9 декабря 2016 г.
Аннотация:A single-fluid 2-D model of the axially-symmetric heliospheric current sheet (HCS) employs the differential rotation of the solar photosphere and takes into account three components of the interplanetary magnetic field (IMF), the solar wind speed, the thermal pressure and diffusion in the HCS. The solar corona and the HCS’ states are tied by boundary conditions and the “frozen-in” equation. The model describes the HCS and surrounding area (the plasma sheet - PS) as a structure having the shape of a thin plasma disk limited by the separatrixes which separate the opened and closed magnetic field lines. The PS’ thickness L decreases with distance r, becoming constant far from the Sun. L ~2.5 solar radii (R0) at 1 AU. Spatial distributions of the poloidal magnetic field and speed and the azimuthal density of the electric current are determined by the boundary conditions for concentration and streams in the neutral plane. Distributions of the azimuthal magnetic field, the speed and the poloidal current density depend mainly on the distribution of the electric potential originated from unipolar induction in the corona. The obtained solutions for fields, speeds and currents are consistent with the Parker’s view on the solar wind both at large heliocentric distances and above separatrixes. At r 350 R0, the IMF spiral may undergo a turn simultaneously with a change of the poloidal current direction (from sunward to anti-sunward). A sharp increase in the azimuthal current density occurs at separatrixes and produces bifurcation of the PS.