W. G. Pilipp

TL;DR: In this paper, it was found that a strong anisotropy in the core of proton distributions, with a temperature that is larger perpendicular rather than parallel to the magnetic field, is a persistent feature of high-speed streams, becoming most pronounced in the perihelion, or about 0.3 AU.

TL;DR: In this paper, the shapes of three typical electron distribution functions, which have been observed by Helios 2 in the solar wind, are analyzed and compared with theoretical predictions, and the main results are as follows: (1) for each distribution function we may discern a break, i.e., a sudden change in the slope of the distribution function, separating the "core" at lower energies from the "halo" at larger energies, and (2) for the anisotropic distributions a significant break is observed in velocity directions opposite to the strahl and perpendicular to it

TL;DR: In this paper, the first part of the Helios-1 mission was used to study the solar corona and the solar wind during the period between 0.3 and 1 AU and the separation of proton double streams and alpha-particles.

TL;DR: In this paper, it was found that there is a strong correlation between the electron properties and the sector structure of the magnetic field, and that anomalous scattering increases significantly toward sector boundaries for all energies up to several hundred eV.

TL;DR: In this paper, the authors investigated the possibility that the recently observed plasma mantle may be the most likely source of the plasma sheet, and they presented two rough models which they used mainly for the description of particle transport in the tail lobes and for a semiquantitative calculation of plasma mantle parameters (density, bulk velocity, and temperature distribution).