Journal article
Experimental Investigation of Dust Density Waves and Plasma Glow
IEEE transactions on plasma science, Vol.38(4), pp.842-846
04/2010
DOI: 10.1109/TPS.2009.2034312
Abstract
Dust density waves (DDWs) are compressional modes that are often excited by subsonic ion flows in dusty plasmas. Previous experiments relying on imaging of only the dust revealed that they can propagate parallel to the ion flow direction or at an oblique angle. An experiment was performed using microgravity conditions on parabolic flights with video imaging of both the dust and the plasma glow. Glow arises from electron-impact excitation of neutral gas atoms, and it serves as a signature of energetic electrons. Averaging over time, it was found that the presence of dust enhances the glow brightness everywhere in the plasma. Resolving the time variation, a spontaneously excited DDW was observed at 3.9 Hz. It was characterized not only by a compression of the dust number density but also by a modulation of the glow intensity. The correlation between the wave and the glow is analyzed by Fourier methods. We found an unexpected phase relation between the plasma glow and the DDW of 118 o . A glow maximum is followed by a dust density maximum.
Details
- Title: Subtitle
- Experimental Investigation of Dust Density Waves and Plasma Glow
- Creators
- Oliver Arp - University of KielDavid Caliebe - University of KielKristoffer Ole Menzel - University of KielAlexander Piel - University of KielJohn A Goree - University of Iowa
- Resource Type
- Journal article
- Publication Details
- IEEE transactions on plasma science, Vol.38(4), pp.842-846
- Publisher
- IEEE
- DOI
- 10.1109/TPS.2009.2034312
- ISSN
- 0093-3813
- eISSN
- 1939-9375
- Language
- English
- Date published
- 04/2010
- Academic Unit
- Physics and Astronomy; Mechanical Engineering
- Record Identifier
- 9984199708802771
Metrics
2 Record Views