d-layer

• Couche inférieure de l'ionosphère, située à environ 35 à 50 miles au-dessus de la surface terrestre, qui réfléchit les ondes radio à basse fréquence.

The lowest region of the ionosphere, located approximately 35 to 50 miles above the Earth's surface, which reflects low-frequency radio waves.

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1. Lowest ionospheric regionC2formalscientific

   The lowest region of the ionosphere, located approximately 35 to 50 miles above the Earth's surface, which is responsible for reflecting low-frequency radio waves.

   Couche D de l'ionosphère

   • The D-layer is crucial for long-distance radio communication.
   • Radio waves are absorbed by the D-layer during the day.
   • The D-layer disappears at night, affecting signal propagation.