That’s the question I have Observers who have been confused for centuries: Does Aurora’s fantastic green and crimson light display produce identifiable sounds?
Auroras, caused by the interaction of solar particles with gas molecules in the Earth’s atmosphere, commonly occur. Near the poles of the earth, Where the magnetic field is strongest. However, reports of aurora making noises are rare and have historically been rejected by scientists.
However, Finnish studies In 2016, he claimed that he finally confirmed that the aurora actually produced a sound that was audible to the human ear. recording One made by one of the researchers involved in the study even claimed to have captured the sound created by the fascinating light 70 meters above the ground.
Still, the mechanism behind the sound remains a bit mysterious, as are the conditions that must be met to hear it. My recent research Understand the process of examining historical reports of aurora sounds to investigate this elusive phenomenon and whether the reported sounds are objective, fantastic, or imaginary. ..
Aurora noise was the subject of particularly lively debate during the first decades of the 20th century. Reports from northern latitude settlements have reported that sound can be accompanied by a fascinating display of light in the sky.
Witnesses talked about quiet, almost imperceptible crackling, grunts, or grunts, especially during the display of intense aurora borealis. For example, in the early 1930s Personal testimony He began to flood the Shetland News, a weekly newspaper in the subarctic Shetland Islands, likening the sound of the northern lights to “buzzing silk” or “two boards meeting a flat road.”
These stories were supported by similar testimony from northern Canada and Norway. Still, the scientific community was uncertain, especially given that few Western explorers claimed to have heard the elusive sound.
The reliability of the aurora noise report from this time was closely related to the altitude measurement of the aurora. Only displays that descended low into the Earth’s atmosphere were thought to be able to convey the sounds audible to the human ear.
The problem here is The 2nd International Polar Year of 1932-3 The aurora found most commonly occur 100 km above Earth and rarely below 80 km. This suggested that it is impossible for identifiable sound from light to be transmitted to the surface of the earth.
Given these discoveries, prominent physicists and meteorologists remained skeptical, dismissing the sounds of the aurora and the very low explanation of the aurora as folk tales and illusions.
Sir Oliver Lodge, a British physicist involved in the development of wireless technology, comment The sound of the aurora can be a psychological phenomenon due to the vividness of the aurora’s appearance — just as meteors sometimes do. Reminiscent of a swooshing sound In the brain.Similarly, meteorologist George Clark Simpson said the appearance of low aurora is probably Optical illusion Caused by low cloud interference.
Nevertheless, Carl Stormer, a leading aurora scientist of the 20th century, Published account Written by two of his assistants who claim to have heard the aurora, it added some legitimacy to the mass of personal reports.
Størmer’s assistant Hans Jelstrup said he heard “a very strange faint whistling sound, a distinctly undulating sound that seems to follow the vibrations of the aurora exactly,” Tjönn said. I experienced a sound like that. These last two testimonies may have been convincing, but they have not yet proposed a mechanism by which the aurora sound works.
Sound and light
The answer to this lasting mystery, which has since gained the most support, was first tentatively proposed in 1923. Clarence Chant, A famous Canadian astronomer. He argued that the movement of the aurora changes the Earth’s magnetic field, causing changes in the electrification of the atmosphere, even at significant distances.
This charge produces a crackling sound that is much closer to the surface of the earth when it hits an object on the ground, like a static sound. This can occur on the observer’s clothing, eyeglasses, or surrounding objects such as fir trees or building cladding.
Chant’s theory correlates well with many explanations of aurora sounds, and is supported by occasional reports of ozone odors. Metallic odor Similar to an electric spark — displaying Northern Lights.
Still, Chant’s treatise was largely overlooked in the 1920s and first recognized in the 1970s. Two aurora physicists Reconsidered historical evidence. Chant’s theory is widely accepted by today’s scientists, Still under discussion How exactly the sound-producing mechanism works.
What is clear is that the aurora rarely makes sounds that are audible to the human ear. The eerie crackling, roaring, and bouncing sounds that accompany the lights represent an objective audible experience, not fantastic or imaginary.
If you want to hear the aurora yourself, you may have to spend a considerable amount of time in the polar regions, given that the auditory phenomenon only appears in the polar regions. 5% of violent aurora displays.. It’s also not a particularly accessible experience, as it’s most often heard at the top of the mountain and surrounded by several buildings.
Nevertheless, in recent years, the sound of the aurora has been explored for its aesthetic value, laying the foundation for new ways of stimulating musical works and interacting with their electromagnetic signals.
Latvian composer Erics Esembals His music uses excerpts from journals from American explorer Charles Hall and Norwegian politician Fridtjof Nansen. His composition, AuroraInterweaves these reports with the only known Latvian folk song that describes the aurora sound phenomenon sung in tenor solos.
Alternatively, you can listen to the Northern Lights radio signal at home. In 2020, BBC3 radio show Aurora’s ultra-low frequency radio recordings have been remapped to the audible spectrum. Although not the same as directly perceiving the audible noise emitted by the aurora on a snow-covered mountain peak, these radio frequencies give a wonderful sense of the temporary and fleeting dynamic nature of the aurora.
This article will be republished from conversation Under a Creative Commons license.read Original work..
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People have long claimed to hear the northern lights. Are the reports true? Source link People have long claimed to hear the northern lights. Are the reports true?
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