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- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 definition "VLF receivers are simple, yet uncommon. Consisting only of an antenna and an audio amplifier, they are sensitive to radio waves with frequencies between a few hundred Hertz and 10 kHz . For comparison, AM broadcast band radios --like the ones in most automobiles-- span the much higher frequency range 540 kHz to 1.6 MHz. Even if there is no lighting in your area, you can still hear VLF crackles from storms thousands of kilometers away. Some sferics travel all the way around the Earth! Radio waves can propagate such great distances by bouncing back and forth between our planet's surface and the ionosphere -- a layer of the atmosphere ionized by solar ultraviolet radiation. The ionosphere, which begins about 90 km above the ground and extends to thousands of kilometers in altitude, makes a good over-the-horizon reflector of low frequency radio waves. [Summary provided by NASA]" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 id "1654871" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_id 4f81c61c-f100-4bc4-9664-d9b70d2f162f @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_id 596a5700-b3fd-4261-b8f8-a054d052e3fe @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_label "Earth Remote Sensing Instruments" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_label "Instruments" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_label "Passive Remote Sensing" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 path_label "Positioning/Navigation" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 prefLabel "VLF RECEIVERS" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 reference "" @default.
- 6a4b960f-f7b0-477d-a8dd-ba55b5110966 tag "Instruments" @default.