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Related Experiment Video

Updated: Feb 14, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

Published on: September 22, 2017

Pulsating aurora from electron scattering by chorus waves.

S Kasahara¹, Y Miyoshi², S Yokota³

¹Department of Earth and Planetary Science, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan.

|February 16, 2018

Summary

This summary is machine-generated.

Scientists observed energetic electrons scattering off chorus waves, causing pulsating aurora. This provides direct evidence for a key mechanism driving these stunning atmospheric light displays.

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Area of Science:

Space Physics
Atmospheric Science
Plasma Physics

Background:

Auroral substorms are dynamic upper-atmosphere phenomena driven by solar wind energy release from the magnetosphere.
Pulsating aurorae are characterized by quasiperiodic, blinking patches caused by precipitating energetic electrons.
The interaction between magnetospheric electrons and whistler-mode chorus waves is a hypothesized cause of this precipitation.

Purpose of the Study:

To provide direct observational evidence of energetic electron scattering by chorus waves.
To confirm the mechanism responsible for generating pulsating aurorae.

Main Methods:

Observations using a magnetospheric spacecraft equipped with electron sensors and electromagnetic field instruments in March 2017.
Analysis of quasiperiodic precipitating electron flux.
Simultaneous observation by a ground auroral imager.

Main Results:

Directly observed energetic electrons being scattered by chorus waves.
Measured precipitating electron flux intense enough to generate pulsating aurora.
Confirmed simultaneous observation of pulsating aurora from the ground.

Conclusions:

The study provides the first direct observational evidence linking chorus waves to energetic electron precipitation and pulsating aurora.
This finding validates a crucial mechanism in space physics responsible for auroral phenomena.