Finson, M. J. & Probstein, R. F. A theory of dust comets. I. Model and equations. – 1968. – Astrophysical Journal. – 154. – P.333, 334
Уривок, який стосується можливим електромагнітним взаємодіям між частинками пилу і сонячним вітром або міжпланетним магнітним полем
Let us consider what forces might act on the dust particles that have not already been considered. One possibility is that the dust particles arc electrically charged, so that electromagnetic forces must be taken into account. In general, a body situated in a plasma, such as the solar wind, will attain a charge. Various estimates of the charge which the dust particles can attain have been made, the results of which indicate that the dust particles can attain voltages of some tens of volts either positively or negatively (Belton 1966b; Notni 1966). For a potential of 30 volts, an interplanetary magnetic-field strength |B| = 5 X 10-5 gauss, and a solar-wind velocity |v| = 500 km sec-1, the Lorentz force q(v x B) on a dust particle is of the order of 0.1-10 times the radiation-pressure force for particle sizes in the range 0.1-10 μ at a radius of 1 a.u. Most important, however, it is unlikely that a Lorentz force would be properly directed to cause the observed dust-tail orientations. The velocity v is essentially radial, and for v x B to be in the comet orbit plane and in the +η direction, B would have to be perpendicular to the comet orbit plane, in the same sense as the comet's angular momentum. That this could be the case for each of the eight pure dust comets considered by Belton and Brandt is highly unlikely in light of the great variation in the orientations of the different comet orbit planes. In addition, it would be incorrect to conclude even that such forces can be exerted on the particles in a comet dust tail, since the tail as a whole must be electrically neutral. In fact, the Debye length in the solar wind is of the same order as, or less than, the estimated interparticle spacing.
Another possible force could arise from currents (j) being set up in the dust tails, thereby giving rise to j x B forces. Here, again, however, particular orientations of the magnetic field with respect to the comet orbit plane would be required to give the desired directionality. Various drag interactions with the solar wind, such as Coulomb drag and induction drag, arc also possible. These forces are aligned with the relative-velocity vector between the solar wind and the comet, and they can all be shown to be quite small.
On the basis of the arguments given, we may conclude that it is highly unlikely that the orientations of the tails of pure dust comets can be explained by any electromagnetic interactions between the dust particles and the solar wind or the interplanetary magnetic field. Therefore, in what follows we shall neglect any such effects on pure dust tails.