If not to see, to hear. Record of sounding of a polar light] is publishe

17.05.2022 Those to whom has the luck to observe a polar light, could hear weak, as if illusive sounds. As a rule, they are audible during the most active episodes of a bright luminescence of the sky. Describe these sounds as "falls at distance", "rushing sounds", or "weak hindrances on air". However new data testify that sounds arise highly in the atmosphere even then when we do not see the polar lights and we do not hear these sounds. The engineer acoustics to honourable professor Unto K. Lyne from Aalto's University Aalto to Finland managed to write down these strange "clapping" sounds in the sky at night, when...