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Whistler Waves at Venus's Quasi-Parallel Bow Shock
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  • Brent Page,
  • Trevor A Bowen,
  • Stuart D. Bale,
  • John W. Bonnell,
  • Anthony William Case,
  • Thierry Dudok de Wit,
  • Keith Goetz,
  • Katherine Amanda Goodrich,
  • Jasper S. Halekas,
  • Peter R Harvey,
  • Justin C. Kasper,
  • Davin E. Larson,
  • Robert John MacDowall,
  • David M. Malaspina,
  • Mitsuo Oka,
  • Marc Pulupa,
  • Phyllis Whittlesey
Brent Page
University of California, Berkeley

Corresponding Author:[email protected]

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Trevor A Bowen
Space Sciences Laboratory
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Stuart D. Bale
UC Berkeley
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John W. Bonnell
University of California, Berkeley
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Anthony William Case
Harvard-Smithsonian Center for Astrophysics
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Thierry Dudok de Wit
CNRS and University of Orléans
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Keith Goetz
University of Minnesota
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Katherine Amanda Goodrich
University of California, Berkeley
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Jasper S. Halekas
University of Iowa
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Peter R Harvey
Space Sciences Laboratory, University of California, Berkeley
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Justin C. Kasper
University of Michigan-Ann Arbor
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Davin E. Larson
University of California, Berkeley
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Robert John MacDowall
NASA Goddard Space Flight Center
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David M. Malaspina
University of Colorado Boulder
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Mitsuo Oka
Space Sciences Laboratory, University of California, Berkeley
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Marc Pulupa
Space Sciences Laboratory, University of California at Berkeley
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Phyllis Whittlesey
University of California, Berkeley
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Abstract

In planetary bow shocks, binary particle collisions cannot mediate the conversion of upstream bulk flow energy into downstream thermal energy, and wave-particle interactions in part assume this role. Understanding the contribution of waves to shock heating requires knowledge of the modes that propagate in different classes of shocks; we describe the growth patterns of whistler waves within the Venusian bow shock. Waves with frequencies $f \lesssim 0.1 f_{ce}$, where $f_{ce}$ is the electron cyclotron frequency, preferentially grow at local minima in the background magnetic field $|B_0|$. Quasi-parallel propagating whistlers with frequencies between $0.1 f_{ce}$ and $0.3 f_{ce}$ are strongest at the downstream ramps of these $|B_0|$ minima. Immediately downstream of the shock, whistlers with frequencies $f < 0.1 f_{ce}$ propagate more than 80$^\circ{}$ oblique from $\vec{B}_0$ and have elliptically polarized $\vec{B}$ fields. A prediction from kinetic theory of the orientation of these waves’ $\vec{B}$ ellipses is confirmed to high accuracy.