While millions watched the eclipse, these scientists listened (2024)

While millions watched the eclipse, these scientists listened (1)

Francisco Rivas Fuenzalida, graduate student at Purdue University captures the sounds of nature as the eclipse begins. Credit: Purdue University photo/Tom Campbell

Three hours before the 2024 total solar eclipse veiled parts of Indiana, the early afternoon cacophony of birds echoes through the forest. The rapid woody knock of a downy woodpecker, the longing call from a mourning dove, the cardinal’s signature whistle, and the lazy buzz of a bumble bee are all noted in the observation sheets of Bryan Pijanowski and his students. The team from Purdue University observes until the songs of more than 20 different bird species quiets down to only the quiet calls of robins and the tufted titmouse.

“Spring peepers!” exclaims Francisco Rivas Fuenzalida, a graduate student research assistant in Pijanowski’s lab at Purdue. The five researchers near the marsh pause and look outward into the vast space. “Yes!” says Pijanowski, celebrating the victory. The chorusing frogs croak their melodious crackle for a few seconds as the countdown to totality begins. The team continues its observation. They signal their excitement by giving each other a thumbs-up or pointing in the direction of a sound they’ve heard.

While millions watched the eclipse, these scientists listened (2)

Like us, animals are sensitive to shifts in a landscape’s sound, light, temperature, and wind. For a short time, a total solar eclipse provides the perfect conditions to study how animals react to these changes. Using various recording devices, Pijanowksi and his team are here to gather the soundscapes of different ecosystems near Butlerville, Indiana, to see how animal circadian rhythms react to the changes in light caused by the eclipse. The team hypothesizes that nocturnal animals will start to chorus as soon as totality begins.

The effort — which is unfunded — is a “one-off” for the sheer joy of sating curiosity, part passion project. Pijanowski is an expert on soundscapes, and gets a lot of questions about how animals react to these types of events. “I have to have answers,” he says. “The next total eclipse … that moment is going to be after my time.”

While millions watched the eclipse, these scientists listened (3)

A past eclipse

This isn’t Pijanowski’s first solar eclipse experiment. In 2017, his team planned an experiment that focused on animal behavior and sound in zoos, county parks, and state forests across all the different phases of a total solar eclipse. “When I was in the middle of the total solar eclipse [in 2017], I was struck by the fact that there were so many similarities between what I was experiencing and what I would view during a sunset,” says Pijanowski.

Shades of orange and purple, which are unusual to see in the afternoon, and drops in temperature and wind speed, were observed by Pijanowski and his team seven years ago. They even captured activity from a common nighthawk, a predator that soars at dusk. But they also captured a lot of anthropogenic noise — noise created by humans. “People were so enthusiastic and excited that we missed some of the important data captures that we wanted,” says Kristen Bellisario, a soundscape ecologist at the John Martinson Honors College and Director of HIFI Lab. Bellisario is also a faculty fellow with the Center for Global Soundscapes. That study was published inEcological Indicators.

While millions watched the eclipse, these scientists listened (4)

This year’s experiment will be different. Pijanowski chose a remote location where he and his students could immerse themselves in only the sounds of nature. A Purdue University-maintained site, about an hour and 30 minutes south of Indianapolis, seemed the perfect place. The land stretches over 2,500 acres and hosts a variety of landscapes. A week before the April 8 eclipse, Pijanowski and his graduate students deployed 16 sensors in 14 locations. The semi-remote forest transformed into an observatory of sound. Hydrophones were sunk into bodies of water, recorders were strapped to trees and placed near the river’s edge, and bat sensors were set up in a cemetery holding an old-growth woodland. These recorders will document the soundscape for a week before eclipse, then during the event, and for another week after the eclipse.

The ever-changing soundscape

On eclipse day, the team takes a winding route through the forest aboard four ATVs packed to the brim with cameras, recorders, and tools that noted wind speed, solar radiation, and temperature. They settle near a body of water with enough openings in the wood’s canopy to observe the Moon cloak the Sun. Here, they split up and set up their camping chairs, taking caution not to step on the thorny vines nipping at their legs. Then the scientists start their listening cycles.

About two hours before totality, Pijanowski calls for a quick reflection and an opportunity for the team to call out species they’ve noted. “The soundscape is dominated by four species of birds,” says Pijanowski. Since 1 P.M. local time, the scientists have not heard the calls of new species of birds, and the early-morning heat is fading into a cool breeze. The spring peepers sing again, but only for a few seconds at a time before quieting down.

While millions watched the eclipse, these scientists listened (5)

Thirty minutes before totality, the birds have stopped calling. They seem more curious. A gnatcatcher, chickadee, and tufted titmouse stand nearby on the branches overlooking the researchers. “They’re coming in and looking at us. So, I’m interpreting that as they sense something’s going on,” Pijanowski says, though it’s only a hypothesis. A train’s horn in the distance cuts through the forest’s orchestra. A few minutes pass, and the spring peepers chorus for a few seconds again. More minutes pass, and the few lone calls of crows and cardinals cut the silence. As totality inches closer, the changes in the marsh’s sound are apparent.

Unexpected sound

Ten minutes before totality, Pijanowski raises his index finger in the air, commanding attention to the trill of the spring peepers. The early-afternoon sounds have transformed into a dusk chorus of fish splashing, seconds of chorusing frogs, a few lone calls of birds, and also silence. At this point, the drop in temperature is more noticeable. Then, a plane pierces the silence. Its rumble is all we can hear.

Three minutes before totality, the plane is gone and the team is on their feet, eclipse glasses in hand or covering their eyes. An owl’s call comes from inside the forest just before totality hits, and Pijanowski whispers the discovery to the team. The Moon then slides in front of the Sun, and the forest landscape changes from a dusk of color to shadows of indigo. “Okay, we are at 100 percent [totality]”, Pijanowksi says. Then, as if on cue, the spring peepers fill the soundscape.

While millions watched the eclipse, these scientists listened (6)

Against the backdrop of a glowing black disk in the sky, the team looks around and smiles at each other in awe. The chorus continues for nearly two minutes before a distant boom echoes through the forest, adding the sound of fireworks to the frogs’ chorus. Still, the frogs sing on. The team looks at each other, brushes it off, and observes the visible planets in the sky. They appear briefly alongside some bright stars before disappearing again as the Moon moves away from the Sun. The landscape transforms again into a world filled with orange color. “That was amazing, except for that,” Fuenzalida says, as he gestures toward the sound of the fireworks.

Human noise

While millions watched the eclipse, these scientists listened (7)

Despite trying to escape into a soundscape filled with the sounds of nature, the team simply couldn’t avoid anthropogenic noise. It has become a part of the natural soundscape. Pijanowski himself travels to the farthest regions on Earth to get away from human noise completely, at times hiking long distances, taking boats, jumping on snowmobiles, and even hitching rides on a helicopter to find the world’s most pristine sounds with no human encroachment. For the most pristine grassland soundscapes, for instance, he must travel far from the few remaining prairies of the Midwest to the Eastern Steppes of Mongolia.

While millions watched the eclipse, these scientists listened (8)

The recorders in the forest will continue to gather the soundscape for another week. The researchers head back to the ATVs to celebrate their success with sugar cookies. They reflect on the number of singing frogs and how quickly the birds quieted. And, of course, the fireworks. “I was very surprised that we would have human interruption here. We thought we had sufficiently found an isolated research area,” says Ballisario.

Fortunately, it does not seem their data will be affected by the added noise. Pijanowski’s team will analyze the recordings using AI to better understand how the eclipse changed the soundscape of southern Indiana at this moment in time. The results might be different during the next eclipse across the U.S., which won’t be for two decades.

Until then, go out and listen.

While millions watched the eclipse, these scientists listened (2024)

FAQs

What did scientists learn during the eclipse? ›

Scientific advances enabled by eclipse observations include a better understanding of the solar corona and greater insight into how the magnetosphere, ionosphere and atmosphere respond to changes in solar flux.

What dazzled scientists in total solar eclipse 2024? ›

Researchers grabbed data that they can't wait to analyse

One thing that many observers were mesmerized by during the eclipse was the appearance of bright red spots protruding from the solar disk. These are called prominences — worm-like filaments of plasma.

Why do scientists like total eclipses so much? ›

The solar wind can impact humans and technology at Earth, so understanding how it becomes accelerated at the Sun can help predict its impacts at home. Total solar eclipses provide an opportunity to study Earth's atmosphere under uncommon conditions.

Did anything happen during the eclipse in 2024? ›

All of North America and Central America experienced a partial solar eclipse but only those within the path of totality — an approximately 115-mile (185-kilometer) wide route through Mexico, 15 U.S. States and Canada — were able to see the moon entirely cover the sun's disk, according to NASA.

What do scientists hope to learn from a total solar eclipse in the US? ›

Earth's atmosphere

The total eclipse also will afford scientists a chance to study changes in part of the Earth's upper atmosphere known as the ionosphere, important because it affects radio waves used for communication and navigation.

What is the scientific explanation of eclipse? ›

Sometimes when the Moon orbits Earth, the Moon moves between the Sun and Earth. When this happens, the Moon blocks the light of the Sun from reaching Earth. This causes an eclipse of the Sun, or a solar eclipse. During a solar eclipse, the Moon casts a shadow onto Earth.

How long will the 2024 eclipse last? ›

These are the stages of a total solar eclipse. The partial phases last about an hour and 20 minutes. The next total solar eclipse to visit North America will be April 8, 2024. The duration of totality will be up to 4 minutes and 27 seconds, almost double that of The Great American Eclipse of August 21, 2017.

What did Einstein predict about the eclipse? ›

Einstein's general relativity theory predicted that the massive sun should bend the light of surrounding stars by about twice as much as predicted per Newton's theory — a change too small to detect with a human eye but potentially visible with telescopes at that time.

What does the Bible say about solar eclipses? ›

Joel 2:31 Prophecy and Omens

The sun shall be turned into darkness, and the moon into blood, before the great and terrible day of the LORD come.” This passage appears to refer to both a solar eclipse (sun turned into darkness) and a lunar eclipse (moon turned into blood).

Can solar eclipse affect your eyes? ›

“Looking at a solar eclipse without the correct eyewear even for a moment can cause what is known as 'eclipse blindness,' or retinal burns, when the cells in the retina get damaged or destroyed and can no longer properly transmit what you see to the brain,” Dr. Abraham said.

What is the rarest eclipse on Earth? ›

A hybrid solar eclipse — the rarest type of solar eclipse — is witnessed when an eclipse shifts between annular and total as the shadow of the Moon moves across the globe.

Why do I feel weird during a solar eclipse? ›

"True illness from experiencing the eclipse is unlikely," says Nicholas E. Kman, MD, an emergency medicine physician at The Ohio State University Wexner Medical Center. "It's possible that the body might be affected by travel, anticipation, or adrenaline from the experience, but true illness is probably unrelated."

Where is the best place to see the 2024 eclipse? ›

  • Lima, Ohio. ...
  • Cleveland, Ohio. ...
  • Erie, Pennsylvania. ...
  • Niagara Falls, New York. ...
  • Buffalo, New York. ...
  • Plattsburgh, New York. ...
  • Sherbrooke, Quebec, Canada. ...
  • Mars Hill, Maine. To be honest, Mars Hill is a small town of some 1,500 residents.
Apr 8, 2024

Why can't you look at a solar eclipse? ›

The sun and eye damage

Exposing your eyes to the sun without proper eye protection during a solar eclipse can cause retinal burns (solar retinopathy). The retina has no sensitivity to pain, and since the effects of retinal damage may not appear for hours, there is no warning that an injury to your eye has occurred.

What did we learn from the eclipse? ›

It was an eclipse that revealed the Sun's radiant crown, called the corona, which is usually too dim to be seen against the Sun's blinding brightness. An eclipse led to the discovery of a new chemical element inside the Sun, named helium after the Greek sun god Helios.

What does NASA study during an eclipse? ›

Looking at Earth's Upper Atmosphere from a Jet Plane

A third experiment aboard NASA's WB-57s studied the charged layer of Earth's upper atmosphere called the ionosphere. The ionosphere is affected by the Sun's radiation and the eclipse serves as a chance to study their connection in a controlled manner.

What I learned about lunar eclipse? ›

A lunar eclipse occurs when the earth is in between the moon and the sun, casting a shadow onto the moon. A lunar eclipse can only occur during a full moon and occurs in three stages, which are called total, partial, and penumbral. During a total lunar eclipse, the sun, earth, and moon are perfectly aligned.

What is the educational value of the solar eclipse? ›

From ancient civilizations to more recent societies, spiritual interpretations have abounded from around the world. Montessori educators today understand that solar eclipses are exciting events that provide students and teachers unique opportunities to learn about astronomy and the beauty of the natural world.

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