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You can watch India's Aditya-L1 solar probe launch live on Sept. 2. Here's what it will do. – Space.com

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After becoming the first nation to successfully land a spacecraft near the south pole of the moon, India is setting its sights on a brighter target. The Indian Space Research Organisation (ISRO) will soon launch its first solar observatory, on a mission to investigate some pressing sun mysteries. 

The spacecraft, Aditya-L1, is scheduled to launch atop a Polar Satellite Launch Vehicle (PSLV) on Saturday (Sept. 2) at 2:20 a.m. EDT (0620 GMT) from Satish Dhawan Space Centre in Sriharikota, India. You can watch it here on Space.com, courtesy of ISRO. 

The launch will send Aditya-L1 into low-Earth orbit. The probe will then engage its propulsion system and head to the Earth-Sun Lagrange Point 1 (hence the L1 part of the mission’s name; “Aditya” means “sun” in Sanskrit), a gravitationally stable about 1 million miles (1.5 million kilometers) from our planet. From there, Aditya-L1 will be able to study the sun without interference from eclipses or occultations. 

Related: Space weather: What is it and how is it predicted?

An illustration shows India’s Aditya-L1 spacecraft studying the sun. (Image credit: IRSO/ Robert Lea/)

The mission has many scientific objectives. Its seven instruments are designed to observe the sun’s atmosphere, its surface (known as the photosphere) and the magnetic fields and particles around our star and closer to home.

One of the most intense regions of study for Aditya-L1 will be the sun’s upper atmosphere, home to one of the most longstanding and troubling mysteries in solar science — the coronal heating problem.

Investigating the sun’s hottest mystery

The corona, made of wispy and nebulous plasma, is of particular interest to solar scientists because of how hot it is. That might sound like a given. After all, we are talking about the atmosphere of the sun here. 

The issue is that the corona is too hot. It’s hotter than the solar surface — far, far hotter. The temperature of the corona can reach 2 million degrees Fahrenheit (1.1 million degrees Celsius), according to NASA. The photosphere, around 1,000 miles (1,600 km) below it, has an average temperature of around 10,000 degrees F (5,500 degrees C), meaning the sun’s outer atmosphere is about 200 times hotter than its surface!

The sun during a total eclipse when the photosphere is obscured by the moon and the corona becomes visible (Image credit: ESO/P. Horálek)

To see why this is so puzzling, imagine a slightly less “out there” example. During a camping trip, you light a campfire, and as you are toasting marshmallows, you notice that the treats roast faster when you hold them farther from the fire. You check and indeed find that the air farther away from the campfire is hotter than the air closer to it. That’s akin to what is happening with the corona. 

The vast majority of the sun’s heat comes from the nuclear fusion at its core. So, temperatures should increase moving toward the heart of our star. And the layers of the sun do conform to this prediction — except for the corona, and scientists are desperate to know why. 

Studying the corona is difficult to do here on Earth because photons — particles of light — from the sun’s surface dominate and “wash out” those from the outer atmosphere. 

The best way to see the corona from Earth is to wait for a total solar eclipse, when the disk of the moon obscures the photosphere and the wispy corona is no longer overpowered. Alternatively, solar scientists can use an instrument called a coronagraph, which attaches to a telescope and replicates this effect.

Aditya-L1 will carry such an instrument, called the Visible Emission Line Coronagraph (VELC). The ISRO probe will also take ultraviolet images of the corona and photosphere using its Solar Ultraviolet Imaging Telescope (SUIT).

Aditya-L1 will do more than just investigate the coronal heating mystery. The probe will also look at solar flares and coronal mass ejections (CMEs), powerful events that can affect life here on Earth.

Related: The worst solar storms in history

Checking out explosive solar weather

The indian Space Research Organisation Polar Satellite Launch Vehicle carrying the Aditya-L1 sun observatory rolls out to its launch pad for a Sept. 2, 2023 launch. (Image credit: ISRO)

CMEs are huge clouds of solar plasma blasted into space when the sun’s magnetic field lines become twisted and then “snap back” into realignment, a process called magnetic reconnection. 

This usually occurs in regions of the sun that are particularly active, something that can be indicated by the presence of sunspots. Sunspots, also known as active regions, can also give rise to solar flares, which are bursts of electromagnetic radiation that often accompany CMEs but can also occur independently. 

Magnetic reconnection hurls out solar plasma at speeds as great as 7 million mph (11 million kph) — around 4,500 times faster than the top speed of a jet fighter. Aditya-L1 will look for the mechanisms that drive these solar phenomena, hunting for processes in the corona and in deeper layers of the sun.

Additionally, the spacecraft will look at these events after they have traveled away from the sun. 

CMEs directed at Earth can reach our planet in as little as 15 to 18 hours, with slower clouds often taking days to reach us. 

Aditya-L1 will study how this plasma changes during its journey from the sun to Earth. It will also make in-situ measurements of the plasma environment close to our planet, using its Aditya Solar wind Particle Experiment (ASPEX) and the Plasma Analyser Package For Aditya (PAPA).

A giant coronal mass ejection burst from the sun toward Venus on Monday (Sept. 5) 2022. (Image credit: NASA/STEREO)

The charged particles blasted out by Earth-directed CMEs are channeled down our planet’s magnetic field lines. They then collide with atoms of oxygen and nitrogen in Earth’s upper atmosphere, creating dazzling light shows called auroras over our planet’s poles. But CMEs can also create space weather conditions around Earth that aren’t quite so pleasing.

For example, the eruptions can spark powerful geomagnetic storms, which can affect satellites and even communication and power infrastructure here on Earth. So it’s vital to understand space weather and the plasma environment of Earth, scientists say. Also important is the understanding of magnetic fields around our planet, which Aditya-L1 will study using its Advanced Tri-axial High-Resolution Digital Magnetometer instrument.

By observing the sun in certain wavelengths of light, scientists can see different features on the star’s surface, like these coronal loops or flux ropes that carry hot material up off the surface. (Image credit: NASA/Solar Dynamics Observatory)

RELATED STORIES:

Other sun puzzles for Aditya-L1

Aditya-L1 will also examine coronal loops, massive hoops of plasma that happen when the curved arc of a magnetic field reaches out of the photosphere and channels plasma through it. 

These loops extend out for thousands of miles, making the sun appear like a massive, messy ball of plasma yarn.

Coronal loops appear to be connected to sunspots; the loops tend to stretch from one of these dark patches on the sun and terminate at another. Scientists aren’t quite sure what the three-dimensional structure of coronal loops is. Some recent research suggests they don’t balloon out as much as they should at high altitudes, indicating that some coronal loops could actually be 2D illusions. 

Aditya-L1 will take diagnostics of coronal loops and the plasma that comprises them, measuring their temperature, velocity and density. The spacecraft will also examine the dynamics of the sun’s magnetic field that guide coronal loops.

The probe’s launch follows shortly on the heels of the successful touchdown of India’s Chandrayaan-3 mission, which last week aced the first-ever soft landing near the moon’s south pole.

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Here’s how Helene and other storms dumped a whopping 40 trillion gallons of rain on the South

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More than 40 trillion gallons of rain drenched the Southeast United States in the last week from Hurricane Helene and a run-of-the-mill rainstorm that sloshed in ahead of it — an unheard of amount of water that has stunned experts.

That’s enough to fill the Dallas Cowboys’ stadium 51,000 times, or Lake Tahoe just once. If it was concentrated just on the state of North Carolina that much water would be 3.5 feet deep (more than 1 meter). It’s enough to fill more than 60 million Olympic-size swimming pools.

“That’s an astronomical amount of precipitation,” said Ed Clark, head of the National Oceanic and Atmospheric Administration’s National Water Center in Tuscaloosa, Alabama. “I have not seen something in my 25 years of working at the weather service that is this geographically large of an extent and the sheer volume of water that fell from the sky.”

The flood damage from the rain is apocalyptic, meteorologists said. More than 100 people are dead, according to officials.

Private meteorologist Ryan Maue, a former NOAA chief scientist, calculated the amount of rain, using precipitation measurements made in 2.5-mile-by-2.5 mile grids as measured by satellites and ground observations. He came up with 40 trillion gallons through Sunday for the eastern United States, with 20 trillion gallons of that hitting just Georgia, Tennessee, the Carolinas and Florida from Hurricane Helene.

Clark did the calculations independently and said the 40 trillion gallon figure (151 trillion liters) is about right and, if anything, conservative. Maue said maybe 1 to 2 trillion more gallons of rain had fallen, much if it in Virginia, since his calculations.

Clark, who spends much of his work on issues of shrinking western water supplies, said to put the amount of rain in perspective, it’s more than twice the combined amount of water stored by two key Colorado River basin reservoirs: Lake Powell and Lake Mead.

Several meteorologists said this was a combination of two, maybe three storm systems. Before Helene struck, rain had fallen heavily for days because a low pressure system had “cut off” from the jet stream — which moves weather systems along west to east — and stalled over the Southeast. That funneled plenty of warm water from the Gulf of Mexico. And a storm that fell just short of named status parked along North Carolina’s Atlantic coast, dumping as much as 20 inches of rain, said North Carolina state climatologist Kathie Dello.

Then add Helene, one of the largest storms in the last couple decades and one that held plenty of rain because it was young and moved fast before it hit the Appalachians, said University of Albany hurricane expert Kristen Corbosiero.

“It was not just a perfect storm, but it was a combination of multiple storms that that led to the enormous amount of rain,” Maue said. “That collected at high elevation, we’re talking 3,000 to 6000 feet. And when you drop trillions of gallons on a mountain, that has to go down.”

The fact that these storms hit the mountains made everything worse, and not just because of runoff. The interaction between the mountains and the storm systems wrings more moisture out of the air, Clark, Maue and Corbosiero said.

North Carolina weather officials said their top measurement total was 31.33 inches in the tiny town of Busick. Mount Mitchell also got more than 2 feet of rainfall.

Before 2017’s Hurricane Harvey, “I said to our colleagues, you know, I never thought in my career that we would measure rainfall in feet,” Clark said. “And after Harvey, Florence, the more isolated events in eastern Kentucky, portions of South Dakota. We’re seeing events year in and year out where we are measuring rainfall in feet.”

Storms are getting wetter as the climate change s, said Corbosiero and Dello. A basic law of physics says the air holds nearly 4% more moisture for every degree Fahrenheit warmer (7% for every degree Celsius) and the world has warmed more than 2 degrees (1.2 degrees Celsius) since pre-industrial times.

Corbosiero said meteorologists are vigorously debating how much of Helene is due to worsening climate change and how much is random.

For Dello, the “fingerprints of climate change” were clear.

“We’ve seen tropical storm impacts in western North Carolina. But these storms are wetter and these storms are warmer. And there would have been a time when a tropical storm would have been heading toward North Carolina and would have caused some rain and some damage, but not apocalyptic destruction. ”

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Follow AP’s climate coverage at https://apnews.com/hub/climate

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Follow Seth Borenstein on Twitter at @borenbears

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Associated Press climate and environmental coverage receives support from several private foundations. See more about AP’s climate initiative here. The AP is solely responsible for all content.

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‘Big Sam’: Paleontologists unearth giant skull of Pachyrhinosaurus in Alberta

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It’s a dinosaur that roamed Alberta’s badlands more than 70 million years ago, sporting a big, bumpy, bony head the size of a baby elephant.

On Wednesday, paleontologists near Grande Prairie pulled its 272-kilogram skull from the ground.

They call it “Big Sam.”

The adult Pachyrhinosaurus is the second plant-eating dinosaur to be unearthed from a dense bonebed belonging to a herd that died together on the edge of a valley that now sits 450 kilometres northwest of Edmonton.

It didn’t die alone.

“We have hundreds of juvenile bones in the bonebed, so we know that there are many babies and some adults among all of the big adults,” Emily Bamforth, a paleontologist with the nearby Philip J. Currie Dinosaur Museum, said in an interview on the way to the dig site.

She described the horned Pachyrhinosaurus as “the smaller, older cousin of the triceratops.”

“This species of dinosaur is endemic to the Grand Prairie area, so it’s found here and nowhere else in the world. They are … kind of about the size of an Indian elephant and a rhino,” she added.

The head alone, she said, is about the size of a baby elephant.

The discovery was a long time coming.

The bonebed was first discovered by a high school teacher out for a walk about 50 years ago. It took the teacher a decade to get anyone from southern Alberta to come to take a look.

“At the time, sort of in the ’70s and ’80s, paleontology in northern Alberta was virtually unknown,” said Bamforth.

When paleontogists eventually got to the site, Bamforth said, they learned “it’s actually one of the densest dinosaur bonebeds in North America.”

“It contains about 100 to 300 bones per square metre,” she said.

Paleontologists have been at the site sporadically ever since, combing through bones belonging to turtles, dinosaurs and lizards. Sixteen years ago, they discovered a large skull of an approximately 30-year-old Pachyrhinosaurus, which is now at the museum.

About a year ago, they found the second adult: Big Sam.

Bamforth said both dinosaurs are believed to have been the elders in the herd.

“Their distinguishing feature is that, instead of having a horn on their nose like a triceratops, they had this big, bony bump called a boss. And they have big, bony bumps over their eyes as well,” she said.

“It makes them look a little strange. It’s the one dinosaur that if you find it, it’s the only possible thing it can be.”

The genders of the two adults are unknown.

Bamforth said the extraction was difficult because Big Sam was intertwined in a cluster of about 300 other bones.

The skull was found upside down, “as if the animal was lying on its back,” but was well preserved, she said.

She said the excavation process involved putting plaster on the skull and wooden planks around if for stability. From there, it was lifted out — very carefully — with a crane, and was to be shipped on a trolley to the museum for study.

“I have extracted skulls in the past. This is probably the biggest one I’ve ever done though,” said Bamforth.

“It’s pretty exciting.”

This report by The Canadian Press was first published Sept. 25, 2024.

The Canadian Press. All rights reserved.

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The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

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TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

The Canadian Press. All rights reserved.

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