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Imágenes de radar de Marte tomadas desde Marte
Science (New York, N.Y.)
|September 27, 1991
Resumen
La cartografía de radar de Marte reveló una región de baja reflectividad llamada Stealth, probablemente un depósito de polvo espeso. La capa de hielo del polo sur mostró una fuerte reflectividad, lo que indica una composición de hielo casi puro con un mínimo de polvo.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La radioastronomía es una radioastronomía.
- La geofísica es la geofísica.
Sus antecedentes:
- La composición y la estructura de la superficie de Marte son fundamentales para comprender su historia geológica.
- La astronomía de radar proporciona un método único para sondear las propiedades del subsuelo.
Objetivo del estudio:
- Mapear la reflectividad del radar de la superficie de Marte utilizando el Very Large Array (VLA).
- Identificar y caracterizar las características geológicas cercanas a la superficie y sus propiedades.
Principales métodos:
- Utilizó el Very Large Array (VLA) en su configuración más grande para el mapeo de alta resolución.
- Empleó radiación de onda continua a una longitud de onda de 3,5 cm desde la Red de Espacio Profundo de Goldstone.
- Se obtuvieron instantáneas individuales de 12 minutos para mapear la densidad de flujo del radar.
Principales resultados:
- Descubrió una gran región en el área de Tharsis, llamada 'Stealth', que exhibe un eco de radar extremadamente bajo, lo que sugiere un depósito de polvo de densidad <0,5 g/cm3 y rocas grandes mínimas.
- Identificó la capa de hielo del polo sur como la característica reflectante más fuerte, compuesta de hielo de CO2 o H2O casi puro con <2% de polvo y una profundidad de 2-5m.
- Se observó otra característica reflectante anómala fuera de Tharsis; la región de Elysium fue pobremente muestreada.
Conclusiones:
- La región "Stealth" representa un depósito significativo de material de grano fino y baja densidad.
- La capa de hielo del polo sur de Marte está compuesta principalmente de agua o hielo de dióxido de carbono.
- El mapeo de radar con VLA ofrece valiosas perspectivas sobre la composición de la superficie y cercana a la superficie de Marte.
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