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Evidencia de turbulencias supersónicas en la atmósfera superior de Júpiter
C Emerich1, L B Jaffel, J T Clarke
1Institut d'Astrophysique Spatiale, CNRS, F-91405 Orsay, France.
Science (New York, N.Y.)
|August 23, 1996
Resumen
La atmósfera superior de Júpiter es sorprendentemente turbulenta, exhibiendo velocidades supersónicas en su brillo diurno. Las observaciones del Telescopio Espacial Hubble revelan perfiles complejos de emisión de hidrógeno Lyman alfa (Ly-alfa), lo que indica un entorno dinámico de Júpiter.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Física de la atmósfera Física de la atmósfera
- Física del espacio Física del espacio
Sus antecedentes:
- La emisión de hidrógeno Lyman alfa (Ly-alfa) es un indicador clave de las condiciones atmosféricas en los gigantes gaseosos.
- Las observaciones anteriores sugirieron una atmósfera superior relativamente estable para Júpiter.
Objetivo del estudio:
- Para analizar la estructura detallada y la variabilidad de la emisión de luz diurna Ly-alfa de Júpiter.
- Para investigar los procesos dinámicos que ocurren en la atmósfera superior de Júpiter.
Principales métodos:
- Utilizó el espectrógrafo de alta resolución de Goddard (GHRS) en el Telescopio Espacial Hubble (HST).
- Se obtuvieron espectros de alta resolución de los perfiles de las líneas de emisión Ly-alfa de Júpiter.
- Analizó las variaciones temporales en escalas de tiempo de minutos.
Principales resultados:
- Se han observado perfiles complejos y muy variables de líneas de emisión de Ly-alfa.
- Se han detectado estructuras significativas en la región del bulto Ly-alfa de baja latitud.
- Estas estructuras corresponden a velocidades supersónicas (varias a decenas de kilómetros por segundo).
Conclusiones:
- La atmósfera superior de Júpiter es inesperadamente dinámica y tormentosa.
- Las velocidades supersónicas observadas desafían las suposiciones anteriores sobre las atmósferas planetarias.
- La atmósfera superior de Júpiter exhibe fenómenos atmosféricos similares a los de las estrellas.
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