It’s always sunny for heliophysicists, but especially so now.
The Solar Orbiter spacecraft, a collaboration between the European Space Agency and NASA, launched yesterday (Feb. 9), less than two weeks after the first public image from a massive new solar telescope showed off the structure of our star in more detail than humans have ever seen. On that same day, Jan. 29, NASA’s Parker Solar Probe made its closest swing pass the sun to date — a record it will continue to break until 2025.
“It’s a great time to be a heliophysicist; we’re launching lots of new missions,” Nicky Fox, head of NASA’s Heliophysics Division, told Space.com. “It’s a very strategic way that we’re looking at this system [of instruments], as one large observatory.”
Although the three missions weren’t designed as a suite, they complement one another well. The Parker Solar Probe, which launched in August 2018, is flying closer to the visible surface of the sun than any spacecraft to date. That trajectory carries the spacecraft deep into the sun’s atmosphere, called the corona, where the probe’s instruments focus on the spacecraft’s immediate surroundings, measuring magnetic fields and particles of plasma, the charged soupy state of matter that makes up the sun.
Solar Orbiter won’t fly as close to the sun, but it brings unique skills. First, it carries two types of instruments. One set, like Parker’s, will study the spacecraft’s surroundings; the other, a set of telescopic instruments, will observe the visible surface of the sun itself at a distance. And partway through its mission, Solar Orbiter will leave the belt around the sun’s middle, called the ecliptic, and begin circling the sun at a tilt, allowing the spacecraft to use those telescopic instruments to produce the first-ever images of the sun’s poles.
The National Science Foundation’s Inouye Solar Telescope is stuck here on Earth, and construction is still underway. But once all of its instruments are operational, there will be plenty more images like the “caramel corn” picture that scientists published in January — the highest-resolution solar image to date. “The Inouye Solar Telescope is a microscope on the sun,” Valentin Martínez Pillet, director of the National Solar Observatory, which runs the facility, told Space.com. The observatory will also measure the wavelengths of light emitted by the sun and decipher the magnetic signature of light that is under the influence of the sun’s magnetic field.
Although the three projects are separate endeavors, both scientists said they and their colleagues are awfully excited about pulling all the data together.
We have so few close-up observations of the sun that being able to compare two separate locations is automatically valuable, no matter where each spacecraft is. Solar Orbiter’s final schedule was dependent on its precise launch date, but as mission personnel evaluated how each timetable aligned the spacecraft with the Parker Solar Probe’s close approaches, they found intriguing opportunities regardless of the launch date, Fox said.
The Inouye Solar Telescope is even easier to integrate into an observational program, Martínez Pillet said; its personnel know precisely where the two spacecraft will be at any given time and can match up the telescope accordingly.
Combining the data from all three observatories is vital for scientists to accomplish the goal that drives the missions: to understand the sun and its influence throughout the solar system. The impacts of the sun’s antics ripple across the solar system as a set of phenomena called space weather.
In Earth’s neighborhood, space weather can interfere with the technology modern society is ever more reliant upon, particularly navigation and communication satellites. Space weather is also a hazard for astronauts traveling farther from Earth, as it can harm both their technology and their bodies. Ultimately, solar scientists want to be able to predict space weather in much the same way meteorologists predict terrestrial weather. “We are 50 or 100 years lagging from what terrestrial weather is in terms of prediction,” Martínez Pillet said.
That’s because scientists just don’t know enough about how the sun works. “We’re able to predict a single second on the sun,” he said. “I’m exaggerating — well, no, I don’t think I’m exaggerating. We’re not able to have any realistic predictive capabilities today, but as soon as you get the physics right, then you start being able to develop predictive capabilities.”
One particular challenge in understanding space weather is the sheer distance involved, and that’s where the trio of missions will be valuable, Martínez Pillet said. “One space-weather event has a combination of scales,” he said. “It’s triggered at really small scales, and it’s a huge thing that propagates all over the heliosphere and probably can hit several planets at the same time.” But by the time space weather reaches Earth, it’s been influenced by millions of miles of space; it’s much fresher where the Parker Solar Probe and the Solar Orbiter can study it.
There’s another reason to understand space weather: It could tell scientists where to look for signs of life elsewhere in the universe. After all, while we humans have a soft spot for the sun, it’s just a star like any other — which means that scientists can apply what these three missions discover to all the stars we’ll never be able to see as clearly. And while space weather is vexing to Earth, it could be deadly in solar systems that surround smaller, more active stars.
And there should be plenty for the trio of projects to study in the coming years. Right now, the sun is pretty quiet, but over the next five or six years, the sun’s activity will increase — and both the Parker Solar Probe and the Solar Orbiter will be on hand to see what happens during that period.
“They are really, truly voyages of discovery, and we’re doing fundamental physics and understanding how a star works,” Fox said.
Of course, even three high-powered missions won’t solve every mystery about the sun.
“We know right now what we don’t know, but we’re going to find a whole lot more things that we don’t know,” Fox said. “That’s why it’s nice that these missions are so long, so you have time to develop these new questions, this new thirst for knowledge.”
Meteor Showers Taking Place Thursday and Friday Night – NorfolkToday.ca
A meteor shower you won’t want to miss.
Gary Boyle, The Backyard Astronomer, tells us we are currently passing through the dusty debris of Comet 109P/Swift-Tuttle.
It last appeared in 1992, and will return again in 2125.
He said the shower is lasting all night long, but 2 a.m. would be the time to see the most meteor.
The Backyard Astronomer suggested keeping an eye out for other things in the sky, as well.
Boyle added the next large shower will be in mid-December, but this one might be a little warmer to sit outside and watch.
Written by Ashley Taylor
New long-necked dinosaur helps rewrite evolutionary history of sauropods in South America – University of Michigan News
A medium-sized sauropod dinosaur inhabited the tropical lowland forested area of the Serranía del Perijá in northern Colombia approximately 175 million years ago, according to a new study by an international team of researchers published in the Journal of Vertebrate Paleontology.
The new species is a long-necked, plant-eating dinosaur known from a single trunk vertebra that is about a half meter tall and wide. The vertebra bears a distinct pattern of bony struts that identify it as the new dinosaur species Perijasaurus lapaz (pear-EE-hah-SOW-roos la-PAHZ)—named in recognition of the mountainous region where it was found and for the 2016 peace treaty that allowed scientists to pursue their research decades after the fossil remains were found in 1943.
Perijasaurus is the northernmost occurrence of a sauropod in South America and represents an early phase in their evolutionary history.
“This new genus and species in the paleotropics allows us to understand a little more about the origin of the sauropods in the Jurassic, as well as how they set the stage for later sauropods from the Cretaceous,” said study lead author Aldo Rincón Burbano, professor of physics and geosciences at the Universidad del Norte in Colombia.
The fossil was first discovered in 1943 during a geological mapping campaign by the Tropical Oil Company. The specimen was taken to the collections of University of California, Berkeley and preliminarily described in 1955.
University of Michigan paleontology curator and professor Jeff Wilson Mantilla examined the specimen as a graduate student in 1997 and later developed a project supported by the Fulbright Foundation to study early sauropod evolution in Colombia.
As part of that project, the Colombian specimen was loaned to U-M, where chief preparator William Sanders removed glues and plaster, greatly increasing the visibility of anatomical details and reducing the total weight of the sample.
“Following repreparation of the fossil, we were able to better visualize the delicate bony laminae that interconnect the projecting parts of the vertebra—the spine, the intervertebral articulations, the rib articulations—the architecture of those connections provides critical morphological information that identifies it as a new species and places it within the sauropod family tree,” Wilson Mantilla said.
A 3D model of the specimen is hosted on the University of Michigan Online Repository of Fossils.
A conflict since 1964 between the Colombian military forces, the FARC guerrilla group and paramilitary groups made it unsafe to conduct research in Serranía del Perijá, near the border between Colombia and Venezuela, until the peace agreements in 2016.
Since then, the research team has been working to determine with higher precision where the fossil was found. A satellite image of the region was superimposed upon a hand-drawn map from 1955 showing the location of the fossil. A further clue was provided by sediment removed from the vertebra itself during the preparation process—allowing the team to determine the specific layer from which the bone was
collected. Fieldwork at the site and neighboring localities helped to reconstruct the paleoenvironment the dinosaur inhabited.
“Perijasaurus lived in an environment of low slopes associated with a river and a forested area. We found fine sand and leaf debris in the sediment deposited in the area where the vertebra was originally found, and it is consistent with the sediment within the neural arch of the vertebra, which are only preserved near a floodplain, i.e., near the slopes of a river, a wooded area,” said Daniel Raad, a former geology student at the Universidad del Norte.
Most of the discoveries of dinosaurs in South America come from rocks from the Cretaceous period located in Argentina and Brazil. Dinosaurs from the northern part of South America are much rarer, particularly during the Jurassic and Triassic periods, during the initial radiation of dinosaurs, when landmasses were still substantially interconnected.
“Although Perijasaurus is represented by a single vertebra, that region of the skeleton provides the most information in sauropods, due to a series of laminae and other structures,” said Martín Ezcurra, a paleontologist and associate researcher of the CONICET (Argentina’s National Council for Scientific and Technical Research) and head curator of paleovertebrates at the Argentine Museum of Natural Sciences.
The researchers were able to determine the evolutionary relationships of Perijasaurus through a computational analysis focusing on Early and Middle Jurassic sauropods.
“Perijasaurus is part of the early radiation of sauropods, which includes species from southern South America, Africa, Asia and Europe,” said Harold Jiménez Velandia, a geologist at the University of Caldas.
The presence of Perijasaurus in the paleotropics of South America, together with its close phylogenetic relationship with geographically widespread species that inhabited low latitudes, suggests that sauropods diversified and dispersed fairly rapidly following a major anoxic event at the end of the Lower Jurassic, when portions of the oceans were depleted of oxygen over large geographic areas.
“What we see in the Early Jurassic, both in high latitudes and in the most tropical areas, is that sauropod species were evolutionarily and geographically interconnected, which is something that had also been seen with other groups of carnivorous and herbivorous dinosaurs,” Ezcurra said.
Sauropods are the largest animals to have walked on land, some reaching estimated lengths of 49 meters and weights of up to 57 metric tons. Their ability to support their weight and move their bodies efficiently stems from a series of adaptations to reduce weight and increase bony support.
An anatomical hallmark of sauropods is vertebral pneumaticity. Essentially, extensions of the air-sac system of the lungs extend into the vertebral column and actually remove internal bone, effectively lightening the skeleton.
“By the Late Jurassic, sauropods had evolved highly pneumatic vertebrae riddled with air spaces that removed one-half to three-quarters the bone weight. Perijasaurus represents an evolutionary antecedent in which the pneumatic invasions are much simpler and more limited in extent, removing less than a quarter of bone volume,” Wilson Mantilla said.
He said the team will continue to focus on regions of Colombia that have exposures of Jurassic sediments.
“Colombia is emerging as a country with great potential to contribute to the paleontology of the continent and the world,” Wilson Mantilla said.
Perijasaurus is permanently stored at the University of California Museum of Paleontology in Berkeley, California. The research was funded by the Fulbright Foundation, Universidad del Norte, Sam Welles Fund and CONICET.
STEVE appears over Canada during 'surprise' solar storm – Livescience.com
In the dark of Sunday night and Monday morning (Aug. 7 and 8), a surprise solar storm slammed into Earth, showering our planet in a rapid stream of charged particles from the sun. The resulting clash of solar and terrestrial particles in Earth‘s atmosphere caused stunning auroras to appear at much lower latitudes than usual — and, in southern Canada, triggered a surprise cameo from the mysterious sky phenomenon known as STEVE.
Alan Dyer, an astronomy writer and photographer based in southern Alberta, Canada, caught the wispy ribbons of green and violet light on camera as they shot through the sky.
“STEVE lasted about 40 minutes, appearing as the … aurora to the north subsided,” Dyer wrote on Twitter (opens in new tab) on Aug. 8. “STEVE was ‘discovered’ here so he likes appearing here more than anywhere else!”
As Dyer noted, the strange sky glow called STEVE was first described by citizen scientists and aurora hunters in northern Canada in 2017. STEVE is typically composed of an enormous ribbon of purplish light, which can hang in the sky for an hour or more, accompanied by a “picket fence” of green light that usually disappears within a few minutes.
The glowing river of light may look like an aurora, but it’s actually a unique phenomenon that was considered “completely unknown” to science upon its discovery. Today, scientists have a slightly better idea of what’s going on.
STEVE (short for “strong thermal velocity enhancement”) is a long, thin line of hot gas that slices through the sky for hundreds of miles. The hot air inside STEVE can blaze at more than 5,500 degrees Fahrenheit (3,000 degrees Celsius) and move roughly 500 times faster than the air on each side of it, satellite observations have shown.
Whereas the northern lights occur when charged solar particles bash into molecules in Earth’s upper atmosphere, STEVE appears much lower in the sky, in a region called the subauroral zone. That likely means solar particles aren’t directly responsible for STEVE, Live Science previously reported. However, STEVE almost always appears during solar storms like Sunday’s, showing up after the northern lights have already begun to fade.
One hypothesis suggests that STEVE is the result of a sudden burst of thermal and kinetic energy in the subauroral zone, somehow triggered by the clash of charged particles higher in the atmosphere during aurora-inducing solar storms. However, more research is needed to uncover the true secrets of STEVE. In the meantime, we can simply bask in its otherworldly glow and wave back at its twinkling green fingers.
Originally published on Live Science.
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