Definition
A radio wave with a relatively short wavelength, generally in the high-frequency (HF) range of about 3 to 30 megahertz. Short waves can travel long distances by reflecting between the ionosphere and the Earth's surface, allowing communication well beyond the line-of-sight range typical of higher-frequency signals.
Plain English
A type of radio wave that bounces off the upper atmosphere, letting it travel much farther than ordinary radio signals. It is used when stations need to talk to each other across long distances, such as over oceans.
Context Anchor
Seen in radio communication discussions, especially when long-distance communication is needed over oceans, remote areas, or beyond normal line-of-sight radio range.
Derivation
Called 'short' because its wavelength is shorter than the longer waves used in early broadcasting. The name compares it to those longer waves, not to other modern radio bands — many bands today are actually shorter still.
Why Pilots Care
Short waves can quickly strengthen or weaken weather systems, affecting cloud cover, turbulence, and thunderstorm potential during a flight.
Grounding Statement
Picture a radio signal leaving the airplane, reaching high into the atmosphere, and being bent back down so it can be received far away.
Intuition Check
Short Wave does not mean a brief radio call or a small ocean wave. Here, it means a radio signal with a specific range of wavelengths used for long-distance communication.
Example Sentence 1
Crossing the North Atlantic, the crew used short wave HF radio to relay position reports to oceanic control.
Example Sentence 2
Checking the 500 mb chart showed a short wave approaching our route, prompting us to add extra fuel for possible deviations.