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La aurora pulsante de la dispersión de electrones por las ondas de coro

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.

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|February 16, 2018
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Este resumen es generado por máquina.

Los científicos observaron que los electrones energéticos se dispersaban en ondas de coro, causando auroras pulsantes. Esto proporciona evidencia directa de un mecanismo clave que impulsa estas impresionantes exhibiciones de luz atmosférica.

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Área de la Ciencia:

  • Física del espacio
  • Ciencias atmosféricas
  • Física del plasma

Sus antecedentes:

  • Las subtormentas aurorales son fenómenos dinámicos de la atmósfera superior impulsados por la liberación de energía del viento solar desde la magnetosfera.
  • Las auroras pulsantes se caracterizan por parches casi periódicos y parpadeantes causados por la precipitación de electrones energéticos.
  • La interacción entre los electrones magnetosféricos y las ondas de coro de modo silbido es una causa hipotética de esta precipitación.

Objetivo del estudio:

  • Proporcionar evidencia observacional directa de la dispersión de electrones energéticos por las ondas de coro.
  • Para confirmar el mecanismo responsable de la generación de auroras pulsantes.

Principales métodos:

  • Observaciones utilizando una nave espacial magnetosférica equipada con sensores de electrones y instrumentos de campo electromagnético en marzo de 2017.
  • Análisis del flujo casi periódico de electrones precipitados.
  • Observación simultánea por una cámara de auroras terrestres.

Principales resultados:

  • Se observa directamente la dispersión de electrones energéticos por las ondas de coro.
  • El flujo de electrones medido es lo suficientemente intenso como para generar auroras pulsantes.
  • Se confirmó la observación simultánea de la aurora pulsante desde el suelo.

Conclusiones:

  • El estudio proporciona la primera evidencia observacional directa que vincula las ondas de coro con la precipitación energética de electrones y las auroras pulsantes.
  • Este hallazgo valida un mecanismo crucial en la física espacial responsable de los fenómenos de las auroras.