Obliquely propagating dust-density plasma waves in the presence of an ion beam.
Self-excited dust-density waves are experimentally studied in a dusty plasma under microgravity. Two types of waves are observed: a mode inside the dust volume propagating in the direction of the ion flow and a new mode propagating obliquely at the boundary between the dusty plasma and the space-charge sheath. A model for dust-density waves propagating at an arbitrary angle with respect to the ion-flow direction is presented, which explains the preference for oblique or parallel modes as a function of ion velocity.
Piel
A
A
IEAP, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany. piel@physik.uni-kiel.de
Klindworth
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M
Arp
O
O
Melzer
A
A
Wolter
M
M