The heaviest rains in mor than a century have sparked floods across Bosnia and Serbia, claiming at least 30 lives and leading to the evacuation so far of more than 16,000 from flooded villages, officials said. "More than 20 corpses have so far been…
For customer support issues contact
support@rawstory.com. Report typos and corrections to
corrections@rawstory.com.
Stories Chosen For You
The well-known monument served as backdrop for the first time for the military honors accorded to visiting dignitaries when they visit Germany.
The Gate is the country's most powerful symbol of unity after years of postwar division. For over three decades it stood just behind the Wall which divided the capitalist West from the communist East Germany.
The British monarch, accompanied by Queen Consort Camilla, was greeted by German President Frank-Walter Steinmeier at the landmark to cheers from well-wishers, who had been standing in the cold for hours to catch a glimpse of the royal pair.
Juergen Edelmann, 52, was among those who had arrived hours ahead of the ceremony to ensure he got one of the 1,500 available spots on the square.
"It's very special to have the honor to welcome a king to Germany," said Edelmann, who works in communications at a hotel, describing the British monarch as a "friend".
Day out
The entry queue brought Edelmann together with Nico Beetz, 20, who had travelled about 100 kilometers (62 miles) from Prenzlau to Berlin for the spectacle.
"You simply must seize the opportunity. It's not often that a king comes to Berlin or Germany where you can see him so close up."
Anja Wieting, 50, who works at a clothing store, took several days off to drive five hours to Berlin with her daughter Lili, 18, for the spectacle.
"It's the visit of the king in Germany. We want to celebrate it, regardless of how long the queue is," she said, adding that she finds "big ceremonies and state visits by royals great".
Silvelin Fiebig, 65, accompanied by her daughter Stefanie, 39, may make the effort to see the king more than once.
Charles has a planned visit close to the retired kindergarten teacher's home in rural Brandenburg on Thursday.
"I'm already thinking about whether I should go," she said.
'Good feeling'
At the airport, the royal couple received a stately welcome.
Standing at the top of the aeroplane stairs, they were given a 21-gun salute and a military plane flypast.
In the visit heavy with symbolism, the color of Camilla's dress drew the immediate comment from rolling news channel's NTV presenter who called it a "European blue".
Charles III has visited Germany 40 times before his return Wednesday for first trip abroad as king © WOLFGANG RATTAY / POOL/AFP
The Queen Consort also made an impression on the crowd by the Brandenburg Gate, where she was accompanied by the German first lady Elke Buedenbender.
"I have always wanted to see the royal family in real life," said 20-year-old Selma Tahirbegovic, a student.
"We loved it," said Kathy Robertson, 63, who comes from Britain but has lived in Germany most of her adult life.
Robertson and her friend, another British Berliner, were "coming away with a good feeling because they made the effort", she said.
On her way down the line of spectators, Camilla complimented a paper crown with a Burger King logo being worn by 19-year-old Andreina Riera from Venezuela.
"I never imagined that could happen -- her noticing me!" she said. "I'm really happy."
© 2023 AFP
The colour of the light corresponds to the release of discrete chunks of energy by the atmospheric particles, and is also an indicator of how much energy was absorbed in the initial collision.
The frequency and intensity of auroral displays is related to activity on the Sun, which follows an 11-year cycle. Currently, we are approaching the next maximum, which is expected in 2025.
Fox Fires, a short film inspired by the Finnish folk tale of the aurora borealis.
Connections to the Sun
Such displays have long been documented by peoples throughout North America, Europe, Asia and Australia.
In the 17th century, scientific explanations for what caused the aurora began to surface. Possible explanations included air from Earth’s atmosphere rising out of Earth’s shadow to become sunlit (Galileo in 1619) and light reflections from high-altitude ice crystals (Rene Descartes and others).
In 1716, English astronomer Edmund Halley was the first to suggest a possible connection with Earth’s magnetic field. In 1731, a French philosopher named Jean-Jacques d'Ortous de Mairan noted a coincidence between the number of sunspots and aurora. He proposed that the aurora was connected with the Sun’s atmosphere.
It was here that the connection between activity on the Sun was linked with auroras here on Earth, giving rise to the areas of science now called “heliophysics” and “space weather”.
Earth’s magnetic field as a particle trap
The most common source of aurora is particles traveling within Earth’s magnetosphere, the region of space occupied by Earth’s natural magnetic field.
Images of Earth’s magnetosphere typically show how the magnetic field “bubble” protects Earth from space radiation and repels most disturbances in the solar wind. However, what is not normally highlighted is the fact that Earth’s magnetic field contains its own population of electrically charged particles (or “plasma”).
Model representation of Earth’s magnetic field interacting with the solar wind.
The magnetosphere is composed of charged particles that have escaped from Earth’s upper atmosphere and charged particles that have entered from the solar wind. Both types of particles are trapped in Earth’s magnetic field.
The motions of electrically charged particles are controlled by electric and magnetic fields. Charged particles gyrate around magnetic field lines, so when viewed at large scales magnetic field lines act as “pipelines” for charged particles in a plasma.
The Earth’s magnetic field is similar to a standard “dipole” magnetic field, with field lines bunching together near the poles. This bunching up of field lines actually alters the particle trajectories, effectively turning them around to go back the way they came, in a process called “magnetic mirroring”.
‘Magnetic mirroring’ makes charged particles bounce back and forth between the poles.
Earth’s magnetosphere in a turbulent solar wind
During quiet and stable conditions, most particles in the magnetosphere stay trapped, happily bouncing between the south and north magnetic poles out in space. However, if a disturbance in the solar wind (such as a coronal mass ejection) gives the magnetosphere a “whack”, it becomes disturbed.
The trapped particles are accelerated and the magnetic field “pipelines” suddenly change. Particles that were happily bouncing between north and south now have their bouncing location moved to lower altitudes, where Earth’s atmosphere becomes more dense.
As a result, the charged particles are now likely to collide with atmospheric particles as they reach the polar regions. This is called “particle precipitation”. Then, when each collision occurs, energy is transferred to the atmospheric particles, exciting them. Once they relax, they emit the light that forms the beautiful aurora we see.
Curtains, colors and cameras
The amazing displays of aurora dancing across the sky are the result of the complex interactions between the solar wind and the magnetosphere.
Aurora appearing, disappearing, brightening and forming structures like curtains, swirls, picket fences and traveling waves are all visual representations of the invisible, ever-changing dynamics in Earth’s magnetosphere as it interacts with the solar wind.
As these videos show, aurora comes in all sorts of colours.
The most common are the greens and reds, which are both emitted by oxygen in the upper atmosphere. Green auroras correspond to altitudes close to 100 km, whereas the red auroras are higher up, above 200 km.
Blue colors are emitted by nitrogen – which can also emit some reds. A range of pinks, purples and even white light are also possible due to a mixture of these emissions.
The aurora is more brilliant in photographs because camera sensors are more sensitive than the human eye. Specifically, our eyes are less sensitive to color at night. However, if the aurora is bright enough it can be quite a sight for the naked eye.
Where and when?
Catching aurora in the southern hemisphere.
Even under quiet space weather conditions, aurora can be very prominent at high latitudes, such as in Alaska, Canada, Scandinavia and Antarctica. When a space weather disturbance takes place, auroras can migrate to much lower latitudes to become visible across the continental United States, central Europe and even southern and mainland Australia.
The severity of the space weather event typically controls the range of locations where the aurora is visible. The strongest events are the most rare.
So, if you’re interested in hunting auroras, keep an eye on your local space weather forecasts (US, Australia, UK, South Africa and Europe). There are also numerous space weather experts on social media and even aurora-hunting citizen science projects (such as Aurorasaurus) that you can contribute towards!
A rare sighting of the aurora australis from central Australia, with Uluru in the foreground.
Get outside and witness one of nature’s true natural beauties – aurora, Earth’s gateway to the heavens.
Brett Carter, Associate Professor, RMIT University and Elizabeth A. MacDonald, Space Physicist, NASA
This article is republished from The Conversation under a Creative Commons license. Read the original article.
{{ post.roar_specific_data.api_data.analytics }}