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Lower-band chorus waves can trigger diffuse aurora by generating second harmonics, causing electron precipitation. This alternative mechanism explains auroral displays and electron distributions in Earth's magnetosphere.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Atmospheric Science

Background:

  • Diffuse aurora is primarily driven by low-energy electron precipitation into Earth's upper atmosphere.
  • Chorus waves, particularly lower-band chorus, are considered key drivers of this electron precipitation.
  • The simultaneous occurrence of upper- and lower-band chorus waves is often cited but not always observed.

Purpose of the Study:

  • To investigate an alternative mechanism for diffuse auroral electron precipitation.
  • To determine if lower-band chorus waves alone or their harmonics can cause diffuse aurora.
  • To explain the formation of pancake electron distributions associated with diffuse aurora.

Main Methods:

  • Analysis of wave-particle interactions in Earth's magnetosphere.
  • Simulations of electron scattering by chorus waves and their harmonics.
  • Examination of electron precipitation triggered by lower-band chorus waves.

Main Results:

  • Lower-band chorus waves alone precipitate electrons with energies above 4 keV.
  • Self-consistently generated second harmonics of lower-band chorus trigger precipitation of electrons below 4 keV.
  • The combined effect of these waves leads to pancake electron distributions and diffuse aurora.

Conclusions:

  • A universal mechanism for chorus-driven diffuse aurora involving second harmonic generation is identified.
  • This mechanism provides an alternative explanation for diffuse aurora formation.
  • The findings may be applicable to auroral phenomena in other planetary magnetospheres.