Observations and Observability of Magnetic Waves due to Newborn Interstellar Pickup Ions

Tuesday, 16 December 2014: 12:05 PM
Charles William Smith1, Poornima Aggarwal2, Matthew R Argall3, Bradford E. Cannon4, Meghan K. Fisher1, Philip A Isenberg5, Colin J. Joyce3, Neil Murphy6, Raquel G. Nuno7, Nathan Schwadron3, David K. Taylor8 and Bernard John Vasquez1, (1)University of New Hampshire Main Campus, Durham, NH, United States, (2)Cooper Union College, New York, United States, (3)University of New Hampshire, Durham, NH, United States, (4)Florida State University, Tallahassee, FL, United States, (5)Univ New Hampshire, Durham, NH, United States, (6)JPL, Pasadena, CA, United States, (7)Arizona State University, Tempe, AZ, United States, (8)Rensselaer Polytechnic Institute, Troy, NY, United States
We bring together several newly published and recently submitted papers in an effort to
develop a refined view of the magnetic waves excited by newborn interstellar pickup ions. First,
we show examples of wave events from 3 separate catalogs we have developed: (1) waves excited by
pickup H+ and observed by the Ulysses spacecraft inside 5.5AU, (2) waves excited by both pickup
H+ and pickup He+ that are observed by the Voyager 1 & 2 spacecraft inside 7AU, and (3)
waves excited by pickup He+ and seen by the ACE spacecraft at 1AU. It is now well-established
that the dissipation of this wave energy is essential to the observed heating of the thermal plasma
in the outer helioshere. However, the traditional theory for these waves suggests that they should
be ubiquitous when they are, in fact, quite rare and difficult to find. We compare wave growth rates
to turbulent cascade rates and argue that under most conditions the turbulence is too aggressive to
allow the waves to achieve observable amplitudes.