10 weird things that happen during a solar eclipse

Eclipses can be strange. Here are some of the weird things you can expect to experience during the Oct. 14 partial eclipse.

On Oct. 14, a partial solar eclipse will be visible in the skies above North, Central and South America, and parts of the Americas will see an annular solar eclipse. This "ring of fire" eclipse will not completely blot out the sun like the total solar eclipse in 2017.  However, the moon will block up to 90% of the sun's disk, depending on the viewer's location.  (To see the next total eclipse, you'll have to wait until April 8, 2024.)

Even though the upcoming eclipse won't be total, it should still be spectacular — and it may still have a few freaky effects. An eclipse "is the most unnatural natural phenomenon you'll ever experience," Tyler Nordgren, an astronomer, artist and author who frequently works with the National Park Service, told Live Science in an interview. Here are a few of the weird things that you might experience during a solar eclipse.

1. Baily's beads

Baily's Beads, total eclipse of the Sun, Turkey, 29 March 2006.Baily's Beads, total eclipse of the Sun, Turkey, 29 March 2006.

If you view a total or annular solar eclipse (safely, with appropriate eye protection), you might notice a sliver of light around the moon's edge that appears beaded, like a necklace. This phenomenon is known as "Baily's beads." Named for astronomer Francis Baily, who described the effect in 1836, it is caused by sunlight interacting with the moon's uneven topography.

2. Solar prominences

A prominence observed along the right edge of the sun rose up and then most of it bent back down to the surface on Oct. 4, 2016.A prominence observed along the right edge of the sun rose up and then most of it bent back down to the surface on Oct. 4, 2016.

Solar prominences, also known as filaments, are huge plasma-and-magnetic-field structures that arise from the sun's surface. Normally, we can't see these protuberances from Earth. But during an eclipse, they may be visible behind the moon, appearing like petals on a flower.

A note of caution: DO NOT look for solar prominences or Baily's beads with your naked eyes! Always wear eclipse glasses.

3. Plunging temperatures

Solar Eclipse, 1851. Painting by Bengt Nordenberg.Solar Eclipse, 1851. Painting by Bengt Nordenberg.

Bring a jacket to your eclipse viewing, because temperatures can drop quickly as the moon covers the sun. How much depends on the location, time of year and type of eclipse. Most places see temperature drops of around 5 to 10 degrees Fahrenheit (2.8 to 5.6 degrees Celsius) during a total eclipse, though the plunge can be larger; one newspaper in 1834 reported a (somewhat improbable) change of 28 F. Annular eclipses usually see a less-extreme temperature change, but things may still get chilly. "It feels like a cloud has come over the sun," Nordgren said. "But there is no cloud over the sun, which just heightens the weirdness."

4. Changing winds

Watercolor of a total eclipse of the sun by Paul Jacob Naftel, Andalucia, Spain, 1870.Watercolor of a total eclipse of the sun by Paul Jacob Naftel, Andalucia, Spain, 1870.

Along with the temperature drop, regions experiencing an eclipse can expect a change in wind direction. First, the wind dies down as the moon gets closer to blocking the sun. After the moon reaches peak coverage, the wind starts to kick back up, often blowing in a different direction, a 2016 study found. This effect occurs with total, annular and even partial eclipses.

5. Confused animals

Seagulls flying above a beach in Kuwait City during the partial solar eclipse event. on December 26, 2019.Seagulls flying above a beach in Kuwait City during the partial solar eclipse event. on December 26, 2019.

When the sky suddenly goes dark in the middle of the day, animals can become very confused, Live Science previously reported. Crepuscular creatures, like cicadas and crickets, might start chirping their evening song. Cows and horses may begin bedding down for the night, while birds return to their roost.

6. Scrambled radio waves

Ham radio operator Louis Breyfogle tuning in on message from satellite Echo I.Ham radio operator Louis Breyfogle tuning in on message from satellite Echo I.

Both total and annular eclipses mess with certain radio wave frequencies — and nobody is quite sure why. Scientists suspect it might have something to do with the way the sun interacts with Earth's ionosphere, which is known to fluctuate in response to things like solar flares and solar storms. On Oct. 14 (and April 8, 2024), citizen scientists and ham radio enthusiasts across North America will be poised to collect more data on how eclipses scramble these transmissions.

7. Mixed-up microbes

Escherichia coli bacteria.Escherichia coli bacteria.

Even microorganisms could be susceptible to a solar eclipse's weird vibes. A 2011 study of bacteria growing on laboratory petri dishes during a total eclipse in India found that the microbes became smaller and differently shaped near the peak of the eclipse. However, these results have not yet been replicated.

8. Weird shadows

Shadows form on the ground as the moon moves in front of the sun in a rare Shadows form on the ground as the moon moves in front of the sun in a rare "ring of fire" solar eclipse in Singapore on December 26, 2019.

As an eclipse passes overhead, most eyes will be glued to the sky. But take a moment to look at the ground — the shadows made by trees and other objects that cause a "pinhole" effect will be dappled with tiny crescents. During the peak of an annular eclipse, "you'll see little rings of light everywhere," Nordgren said. These eclipse shadows also occur during partial eclipses, and the effect can be quite beautiful.

9. Shadow bands (total eclipse only)

A background of light patterns.A background of light patterns.

Seconds before an eclipse reaches totality, wavy stripes of light and dark might appear on solid-colored surfaces. "It's like being at the bottom of a swimming pool," Nordgren said. These "shadow bands" are a bit of a scientific mystery — astronomers still don't know exactly what causes them or why they only sometimes appear. Some scientists hypothesize that the bands may be a manifestation of the rippling distortions of Earth's atmosphere. But whatever they are, they've been well documented; records of them date as far back as the ninth century, according to NASA.

10. Visible stars and planets (total eclipse only)

A composite of the August 21, 2017 total solar eclipse showing third contact – the end of totality – with sunlight beginning to reappear and the array of pink prominences along the limb of the Sun Seconds later the emerging Sun and diamond ring overwhelmeA composite of the August 21, 2017 total solar eclipse showing third contact – the end of totality – with sunlight beginning to reappear and the array of pink prominences along the limb of the Sun Seconds later the emerging Sun and diamond ring overwhelme

During a total solar eclipse, the moon blocks out enough of the sun's light for stars and planets to appear in the sky. Only the brightest of these will be visible, however, and which ones show up will depend on Earth's position at the time. For example, during the 2024 total eclipse, you may be able to see Venus and Jupiter. Unfortunately, it won't be dark enough for this to happen during an annular eclipse. "It never gets full-on night," Nordgren said. "But the light level does change."

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By Joanna Thompson / Live Science Staff Writer

Joanna Thompson is an intern for Live Science with a deep love for nature. She holds a B.S. in zoology and a B.A. in creative writing from North Carolina State University, and will complete her Master's degree from New York University's Science, Health and Environmental Reporting Program in December 2021. Her work has appeared in Scientific American, Atlas Obscura, Audubon and In These Times.

(Source: livescience.com; October 14, 2023; https://tinyurl.com/hj6d95m5)
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