Further experiments on collisional tribocharging of cosmic grains

Collisional Consequences of Big Interstellar Grains

Identification by the Ulysses spacecraft of interstellar grains inside the planetary system provides a new window for the study of diffuse interstellar matter. Dust particles observed by Ulysses and confirmed by Galileo are more massive (≥ 10−13 g) than the ’classical’ interstellar grains. Even bigger grains (≈ 10−7 g) were observed in form of interstellar meteors. We analyze the consequences o...

Granular Flow, Collisional Cooling and Charged Grains

The non-Newtonian character of granular flow in a vertical pipe is analyzed. The time evolution of the flow velocity and the velocity fluctuations (or granular temperature) is derived. The steady state velocity has a power law dependence on the pipe width with an exponent between 3/4 and 3/2. The flow becomes faster the more efficient the collisional cooling is, provided the density remains low...

Collisional effects on nonlinear ion drag force for small grains

PR/v98/i6/p1632_1A. Ivlev, S. Khrapak, S. Zhdanov, G. Morfill, and G. Joyce, Physical Review Letters 92,1 (May 2004), ISSN 0031-9007, http://link.aps.org/doi/10.1103/PhysRevLett.92. 205007M. Lampe, G. Joyce, G. Ganguli, and V. Gavrishchaka, Phys. Plasmas 7, 3851 (2000),ISSN 1070664X, http://link.aip.org/link/PHPAEN/v7/i10/p3851/s1&Agg;=doiM. Lampe, G. Joyce, and G. Ganguli, I...

The Secrets of Cosmic Grains

Cosmic dust grains strike again

A detailed simulation of air showers produced by dust grains has been performed by means of the aires Monte Carlo code with the aim of comparing with experimental data. Our analysis indicates that extensive dust grain air showers must yet be regarded as highly speculative but they cannot be completely ruled out. PACS number(s): 98.70.Sa, 98.70.-f