Abstract
It is shown that if a longitudinal wave is excited in a collision-free plasma and Landaudamps away, and a second wave is excited and also damps away, then a third wave (i.e., the echo) will spontaneously appear in the plasma.
- Received 29 May 1967
DOI:https://doi.org/10.1103/PhysRevLett.19.219
©1967 American Physical Society
