"108582157"^^ . "0"^^ . . . . . . "D-layer"@en-us . . "the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves"@en-us . . . "108057657"@en-us . . . . "D region"@en-us . "D-layer"^^ . "08582157-n"^^ . "0"^^ . . "106326922"@en-us . . .