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Partículas energéticas en Venus: resultados de Galileo Galilei
Science (New York, N.Y.)
|September 27, 1991
Resumen
Galileo Galileo es el nombre de Galileo.
Área de la Ciencia:
- Física del espacio Física del espacio
- Ciencias planetarias Ciencias planetarias.
- Física del plasma es la física del plasma.
Sus antecedentes:
- El detector de partículas energéticas (EPD) de la nave espacial Galileo estudió partículas cargadas en Venus.
- Las observaciones anteriores de partículas energéticas cerca de Venus fueron limitadas.
Objetivo del estudio:
- Para medir los espectros de energía y las distribuciones angulares de iones y electrones energéticos cerca de Venus.
- Para investigar el origen y los mecanismos de aceleración de estas partículas.
Principales métodos:
- Utilizó el Detector de Partículas Energéticas (EPD) de la nave espacial Galileo.
- Se analizaron espectros de energía diferencial y distribuciones angulares de iones (>22 keV) y electrones (>15 keV).
- Las observaciones de partículas correlacionadas con el campo magnético de Venus y los modelos de arco de choque.
Principales resultados:
- Eventos de partículas episódicas fueron detectados cerca de la aproximación más cercana de Venus.
- Se observaron distribuciones angulares altamente anisotrópicas, ordenadas por el campo magnético.
- Los espectros de energía de ley de potencia medidos se extienden hasta 280 keV, lo que indica una asociación con la región de choque frontal-arco.
Conclusiones:
- Los iones energéticos observados están vinculados a la región de choque frontal-arco de Venus.
- La aceleración de la deriva de choque en el arco de choque venusiano es el mecanismo de aceleración probable.
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