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The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10-kilometre (6 mi) wide area.
The programme is a rebranded version of Night Waves, "Radio 3's flagship arts and ideas programme". [2] Night Waves was broadcast every Monday to Thursday evening, except during the Proms season . Radio 3 rebranded Night Waves as Free Thinking from 7 January 2014, and reduced the number of first-time broadcasts per week from four to three (plus ...
Day-evening-night average level, DENL or Lden: This measurement, commonly used in European countries, assesses the 24 hour average in a year (similar to DNL); however, this measurement separates evening (4 hours, 19:00-23:00 or 7:00pm–11:00pm) from night hours (8 hours, 23:00-7:00 or 11:00pm–7:00am) and adds a 5 dB penalty to evening and 10 ...
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Eerie noises have been recorded all over the world recently. NASA is now offering up a possible explanation.
The day–evening–night noise level or L den is a 2002 European standard to express noise level over an entire day. It imposes a penalty on sound levels during evening and night [ 1 ] and it is primarily used for noise assessments of airports , busy main roads, main railway lines and in cities over 100,000 residents.
When these waves are converted into audio signals, scientists have found them to sound similar to birds chirping. Schematic showing occurrence of chorus waves (Chengming Liu et al., Nature (2025))