SH016-0005
Observations of Low-Frequency Waves Excited by Newborn Interstellar Pickup He+ as Seen by the Juno Spacecraft

Wednesday, 9 December 2020
Poster
Sydney Neuman1,2, Charles William Smith3, Matthew R Argall3, Colin Joyce4, Philip A Isenberg5, Bernard John Vasquez3, Nathan Schwadron3, Maciej Bzowski6 and Marzena A. Kubiak6, (1)University of New Hampshire Main Campus, Department of Physics and Institute for the Study of Earth, Oceans and Space, Durham, NH, United States, (2)Rensselaer Polytechnic Institute, Materials Science and Engineering Department, Troy, NY, United States, (3)University of New Hampshire, Durham, NH, United States, (4)Princeton University, Department of Astrophysical Sciences, Princeton, NJ, United States, (5)Univ New Hampshire, Durham, NH, United States, (6)Space Research Centre Polish Academy of Sciences, Warsaw, Poland
Abstract:
We report an analysis of low-frequency waves in the Juno magnetic field data that arise from newborn interstellar pickup He+. Neutral He can reach inside 1 AU in significant numbers whereas interstellar neutral H cannot. We do find a significant number of the waves excited by pickup He+ inside the 3 AU boundary where waves due to interstellar H+ are not found. However, we find additional waves due to interstellar He+ beyond 3 AU and all the way to Jupiter. While theory indicates that wave excitation is continuous, the ability to observe the waves reflects the interplay of neutral He ionization by solar EUV vs the changing solar wind turbulence conditions. Our analysis will address this and related questions.
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