Abstract

A careful survey of high-resolution Ulysses measurements has unconvered many new examples of magnetic waves excited by newborn interstellar pickup ions. We use 72 examples of observations that can credibly be attributed to pickup ions and ask the question “Why are they so seldom observed?” We find that the turbulent cascade generally overwhelms the wave excitation process so that waves are unable to reach observable power levels. The exception to this is when the background power spectrum is reduced, the cascade is similarly weakened, and the wave excitation process dominates the local dynamics.

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