sentix Survey results () | sentix Weekly
The bright dots visible in the magnification are the individual wind turbines in the wind farm. Dark areas indicate a smooth sea surface.
Areas with higher wind speeds and resulting rougher sea show up as as brighter areas. Since waves in the North Sea are mainly caused by wind, the images allow conclusions to be drawn about wind conditions.
Even up to as much as 70 kilometres behind the turbines of the offshore wind farms, the scientists have been able to detect large-scale wakes.Flirten lernen als Mann - Die 6 besten Flirttechniken
The wind speeds in these areas are lower than in undisturbed areas and the energy yield is reduced as a result. This is because the upstream wind turbines act as an obstacle to the wind and slow it down.
Optimise positions for wind farms Comparisons with meteorological measurements at the research platform FINO-1, which is located 50 kilometres off the island of Borkum in direct proximity to the Alpha Ventus wind farm, have also shown that the length of the wakes depends on the stability in the atmosphere. For example, in a situation where the water is warm and the air above it is cold, this creates a situation like in a pot with boiling water. However, wind turbines do not always lead to a reduction of the water surface roughness.
Only on very rare occasions does a neutrino interact with its surroundings. It therefore takes huge detectors in order to capture at least a few of these rare reactions. For the IceCube detector, an international consortium of scientists headed by the University of Wisconsin in Madison USA drilled 86 holes into the Antarctic ice, each metres deep. Into these holes they lowered light sensors, spread out over a total volume of one cubic kilometre.
Research into offshore wind power
The sensors register the tiny flashes of light that are produced during the rare neutrino interactions in the transparent ice. Five years ago, IceCube furnished the first evidence of high-energy neutrinos from the depths of outer space.
However, these neutrinos appeared to be arriving from random directions across the sky. Within minutes of recording the neutrino, the IceCube detector automatically alerted numerous other astronomical observatories. A large number of these then scrutinised the region in which the high-energy neutrino had originated, scanning the entire electromagnetic spectrum: Sure enough, they were able for the first time to assign a celestial object to the direction from which a high-energy cosmic neutrino had arrived.
Astrophysicists have long suspected that these jets generate a substantial proportion of cosmic particle radiation.
Research into offshore wind power: Where the wind blows
The active galaxy that has now been identified is a so-called blazar, an active galaxy whose jet points precisely in our direction. Now, an earthbound gamma-ray telescope also recorded a signal from it. This led to a comprehensive picture of the radiation emitted by this blazar, all the way from radio waves to gamma-rays carrying up to billion times as much energy.
Search in archives reveals further neutrinos A worldwide team of scientists from all the groups involved worked flat out, conducting a complicated statistical analysis to determine whether the correlation between the neutrino and the gamma-ray observations was perhaps just a coincidence.
This may not sound very large, but it is not small enough to quell the professional scepticism of physicists. A second line of investigation rectified this. The IceCube researchers searched through their data from the past years for possible previous measurements of neutrinos coming from the direction of the blazar that had now been identified.