On October 23rd, while North America was witnessing a partial eclipse of the sun, the Hinode spacecraft observed a “ring of fire” or annular eclipse from its location hundreds of miles above the North Pole. This image was taken by the X-ray Telescope – the XRT.
The Hinode spacecraft was in the right place at the right time to catch the solar eclipse. What’s more, because of its vantage point Hinode witnessed a “ring of fire” or annular eclipse…
…The XRT was developed and built by the Smithsonian Astrophysical Observatory and the Japan Aerospace Exploration Agency. Hinode’s X-ray Telescope is the highest resolution solar X-ray telescope ever flown.
The XRT collects X-rays emitted from the sun’s corona — the hot, tenuous outer layer that extends from the sun’s visible surface into the inner solar system. Gas in the solar corona reaches temperatures of millions of degrees. The energy source that heats the corona is a puzzle. The sun’s surface is only 10,000 degrees Fahrenheit, while the corona is more than 100 times hotter.
Science is so beautiful. But, then, the quest for truth always is.
DNA analysis of a 45,000-year-old human has helped scientists pinpoint when our ancestors interbred with Neanderthals…The genome sequence from a thigh bone found in Siberia shows the first episode of mixing occurred between 50,000 and 60,000 years ago.
The male hunter is one of the earliest modern humans discovered in Eurasia.
The study in Nature journal also supports the finding that our species emerged from Africa some 60,000 years ago, before spreading around the world…
The work of Prof Svante Paabo, from the Max Planck Institute in Leipzig, Germany, is rewriting the story of humanity. Prof Paabo and his colleagues have pioneered methods to extract DNA from ancient human remains and read its genetic code.
From this sequence, the scientist has been able to decipher an increasingly detailed story of modern humans as they spread across the globe.
“The amazing thing is that we have a good genome of a 45,000-year-old person who was close to the ancestor of all present-day humans outside Africa…”
Prof Paabo has analysed DNA from part of a leg bone of a man that lived in Western Siberia around 45,000 years ago. This is a key moment at the cross roads of the world, when modern humans were on the cusp of an expansion into Europe and Asia.
The key finding was that the man had large, unshuffled chunks of DNA from a now extinct species of human, Neanderthals, who evolved outside of Africa.
“Our analysis shows that modern humans had already interbred with Neanderthals then, and we can determine when that first happened much more precisely than we could before…”
Prof Paabo’s 45,000-year-old man seems to have lived at a point that was both geographically, and in time, a crossroads for humanity…”This does seem to mark a watershed where modern humans were pushing the boundaries further and further in their dispersal out of Africa,” according to Prof Chris Stringer.
Prof Paabo also compared the DNA of the man living 45,000 years ago with those living today. He found that the man was genetically midway between Europeans and Asians – indicating he lived close to the time before our species separated into different racial groups.
Fascinating stuff. I’ve had DNA tests that determined the coarser texture of how my ancestors spread from their African genesis into the steppes of Central Asia. Eventually ending up traveling west to the Scottish Highlands and, then, sweeping back east to the Danube before retreating to stay in Scotland.
A newly published study reveals the importance of earthworms, beetles, and other tiny creatures to the structure of grasslands and the valuable ecosystem services they provide.
When asked to describe a forest or a meadow, most people would probably begin with the plants, the species diversity, or the color of the foliage. They probably wouldn’t pay much attention to the animals living in the soil.
But a new Yale-led study shows the critical importance of earthworms, beetles, and other tiny creatures to the structure of grasslands and the valuable ecosystem services they provide.
During a 3-year study, researchers found that removing these small animals from the soil of a replicated Scottish sheep meadow altered the plant species that grew in the ecosystem, reduced overall productivity, and produced plants that were less responsive to common agricultural management, such as fertilization.
The results reflect the long-term ecological impacts of land use changes, such as the conversion of forests to agricultural land…
“We know these soil animals are important controls on processes which cause nutrients and carbon to cycle in ecosystems, but there was little evidence that human-induced loss of these animals has effects at the level of the whole ecosystem, on services such as agricultural yield,” said Mark Bradford…lead author of the study…
“Yet that’s exactly what we found.”
RTFA for the details of approach, method, discovery. The Yale School of Forestry has been around a couple thousand years – it feels like, sometimes. They never stop pressing for more and better understanding of the environment.
In case the Pentagon didn’t make it clear enough that climate change is a real and dangerous thing in its Quadrennial Defense Review (QDR) earlier this year, perhaps the new Climate Change Adaptation Roadmap (PDF) will drive the point home. Some of the content is roughly the same, but that title sure makes it sound more desperate.
The gist is that the Pentagon’s futurists foresee a world where our changing climate has tremendous real-world effects, and they want to be ready. Lots of people know the climate is changing, but given the Pentagon’s budget, it’s nice to know they are preparing to protect us from things that might actually harm us …In the 2014 CCAR, the Secretary of Defense, Chuck Hagel, writes that the Department of Defense will focus on just those sorts of threats:
A changing climate will have real impacts on our military and the way it executes its missions. The military could be called upon more often to support civil authorities, and provide humanitarian assistance and disaster relief in the face of more frequent and more intense natural disasters. Our coastal installations are vulnerable to rising sea levels and increased flooding, while droughts, wildfires, and more extreme temperatures could threaten many of our training activities. Our supply chains could be impacted, and we will need to ensure our critical equipment works under more extreme weather conditions. Weather has always affected military operations, and as the climate changes, the way we execute operations may be altered or constrained.
Unless, of course, you’re a numbnut Republican or one of the remaining cowardly lions known as Blue Dog Democrats. No action is preferable to delayed action as far as they are concerned. Not that Hagel is much of an advocate when he prates about scientists “converging” towards consensus. Almost as stupid as saying we’re fairly certain astronomers are nearing the day when they can confirm the Earth ain’t flat. Since they’re afraid of offending folks worrying about falling off the edge.
The plan is laid out in some detail in the 20-page PDF that talks about how recurrent flooding is already affecting the Hampton Roads area of Virginia, “which houses the largest concentration of US military sites in the world” (page 2) and how “climate change will have serious implications for the Department’s ability to maintain both its built and natural infrastructure, and to ensure military readiness in the future” (page 8).
The Pentagon is also aware that it will likely need to conduct more humanitarian missions after natural disasters and it will need to have its weapons work no matter what the weather is like out there. We’ll see if the message is heard this time.
Thanks, Mike, great minds and etc.
By Morten Rustad – and absolutely stunning.
Fire modeling tools rely on information from the National Weather Service, detailed maps of fuel layers in forests and other factors. They estimate how fast the fire will burn and how it will spread in relation to vegetation, trees, homes and other properties.
For Joe Hudson and Byron Bonney, the WFDSS program calculated the Johnson Bar fire’s potential spread within a 26,000-acre planning area where firefighter actions could slow or stop the fire. The modeled fire behavior informed them on the potential effects on threatened values: homes along the Selway and in nearby Lowell, a rustic lookout, the historic Tahoe Trail, habitat for fish, and timber and replanted forests.
“Once the fire has escaped initial direct attack, the goal is to protect the values at risk and contain the fire,” said Hudson.
Hudson called in the Incident Management Team, an interagency group that manages large fires. The IMT set up camp Aug. 8 at the Kooskia airport, 20 miles west of the fire.
Winds were pushing the fire north. Winds were gusting 35 mph on the ridges, triggering an Aug. 12 flare that doubled the size of the fire in one day. People living in the 30 homes along the Selway already had been evacuated.
The IMT kept the fire from spreading and establishing itself on the other side of the river. The WFDSS analysis was helping guide their decisions.
With the fire spreading down the slopes of the Selway and Middle Fork Clearwater River, the managers decided to perform burnouts using the rivers as barriers.
It worked. Welcome rains helped tame the fire. Firefighters were able to establish containment lines.
There are a few sections to this article – each valuable. It all leads up to fire science, divining the factors affecting heat, fuel and oxygen – the determinants of a fire.
Read the article. Especially if you live in the Moiuntain West.
TechKnow on Aljazeera America had a good segment on these studies a week or so ago. Here are the producer’s notes. Haven’t a video of the segment, yet – only a promo for the show.
Iceland’s Bárðarbunga eruption has unleashed a huge quantity of lava — enough to create a landmass the size of Manhattan. What would it be like to watch that terrifying explosion from inside the volcano’s cone? Now you can see for yourself…
Here’s the whole video, as shot via drone by Eric Cheng of camera drone manufacturers, DJI. Cheng explains in a making of video that getting the footage resulted in a melted camera face. The SD card, however, survived, giving this footage possibly the most legit claim to the phrase “face-meltingly awesome” ever.
As much as I criticize editorial content at Reuters since the takeover of this historic firm by the conservative Thomson organization – bespoiling a tradition of fairly neutral reporting on life and events around this small planet of ours – they haven’t yet screwed up the companion thread of collating great photography by some of the bravest and most talented folks working with camera graphics.
These are a few of what the editors feel were the best of September.
Palestinians commute in ruins of Israeli invasion in Gaza — REUTERS/Mohammed Salem
Anti-war protesters confront Secretary of War Chuck Hagel — REUTERS/Kevin Lamarque
Pilots with the Thunderbirds perform the calypso pass maneuver — REUTERS/Tech. Sgt. Manuel J. Martinez
Police salute at the funeral of slain State Trooper Bryon Dickson — REUTERS/Mike Segar
Click through and reflect upon civilization, this past month.