Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh13b1521j&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH13B-1521
Physics
[2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2151] Interplanetary Physics / Neutral Particles, [2152] Interplanetary Physics / Pickup Ions, [2159] Interplanetary Physics / Plasma Waves And Turbulence
Scientific paper
We report observations of low-frequency magnetic waves due to newborn interstellar pickup He+ ions. The excitation of low-frequency waves due to resonance with newborn pickup ions is a well-understood process involving cyclotron resonance between a ring-beam ion distribution and Alfven or fast-mode waves. A small number of published examples of waves due to interstellar pickup protons exist [Murphy et al., 1995] and the core of this effort has been to extend those observations to include a broader range of spacecraft and solar wind conditions. In our investigations of Ulysses and Voyager 2 data sets, we have located periods of simultaneous wave excitation due to both pickup protons and He+ near 4 AU. We argue these ions do not have a Jovian source. To our knowledge, this is the first report of wave excitation due to interstellar He+ pickup ions. Reference: Murphy et al., Space Sci. Rev., 72, 447-452, 1995.
Isenberg Philip A.
Joyce Colin J.
Murphy Neil
Schwadron Nathan A.
Smith Walter C.
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