Accession Number:

AD0707022

Title:

CONCERNING SOME PROPERTIES OF DUST IN SPACE,

Descriptive Note:

Corporate Author:

DEFENCE SCIENTIFIC INFORMATION SERVICE OTTAWA (ONTARIO)

Personal Author(s):

Report Date:

1970-05-01

Pagination or Media Count:

5.0

Abstract:

Any dust particle or body in space, it seems, in most cases bears an electric charge. Because of the greater mobility of negative electrons as compared with positive ions, dust particles in an ionized gas always, in the absence of light, become negatively charged. In this case their equilibrium potential is that at which the influx of positively and negatively charged particles is equalized. Calculations show that in a proton-electron plasma with a Maxwellian distribution of velocities the said equilibrium potential E sub 0 in volts approximately equals the mean energy E of the gas, in electron-volts multiplied by the square root of 10. In a plasma containing ions heavier than protons the equilibrium potential will be greater. In regions of cosmic space with a high density of radiation for instance, in the vicinity of a star it is more probable that dust particles will have a positive charge of a few volts potential, due to photoelectric emission. A dust particle may also acquire a charge through friction with a neutral gaseous medium, even in the entire absence of radiation. Author

Subject Categories:

  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE