It will provide the German and the international community of solar physicists with new and better instrumentation which will enable them to investigate our home star in unprecedented detail.
GREGOR telescope building
Studying the Sun is a key to understand the physical processes on and in the majority of stars. Moreover, there is also a very practical aspect: the solar activity affects or even damages satellite systems and power networks in some regions on Earth. Knowing more about it may help to mitigate expensive damages.
The inauguration ceremony will take place on May 21, 2012 on Tenerife.
GREGOR is a solar telescope with an aperture of 1.5 meters and has been designed to carry out observations of the solar photosphere and chromosphere in the visible and infrared part of the spectrum. Due to its large diameter it will allow observations with higher resolution than was possible before. A novel “adaptive optics system” is able to compensate for atmospheric disturbances and provides a detailed image of the Sun, similar to what would be achieved if the telescope was in space. The resulting high spatial, spectral, and temporal resolution will allow scientists to follow physical processes on the Sun on spatial scales as small as 70 km.
During night time GREGOR can also observe bright stars. It will mainly be used for long term monitoring of stars in order to find out whether the distant suns show similar cyclic behaviour as our own.
GREGOR’s design is completely open in order to enable wind cooling of the telescope structure and the mirrors. The classical dome has therefore been replaced by a retractable structure which allows natural air flushing. This open structure places high demands on the mechanical stability of the telescope structure in order to eliminate wind-induced vibrations.
The primary mirror is a lightweight filigree structure made of a special material that does not deform under the heat of the bright Sun. Additionally, the mirror is actively cooled from the back in order to prevent the front side from heating up and thus producing internal turbulence.
From the telescope the light is guided into the laboratory rooms where it can be distributed to a number of analyzing instruments:
- An imaging setup produces images of the solar surface at various wavelengths. These images are expected to show an extraordinary richness of details.
- Studying the photosphere and chromosphere of the Sun, analyzing the interaction of the solar magnetic field and the highly dynamic plasma, will be possible thanks to the interferometric setup.
- A spectrograph will analyze the solar atmosphere by looking into the near infrared part of the spectrum. It will be able to produce detailed maps of the solar magnetic field.
GREGOR will be accessible to the international solar physics community and has the potential to provide a significant boost to solar physics worldwide.
The GREGOR solar telescope has been built by a German consortium under the leadership of the Kiepenheuer-Institut für Sonnenphysik in Freiburg with the Leibniz-Institut für Astrophysik Potsdam and the Max-Planck-Institut für Sonnensystemforschung in Katlenburg/Lindau as partners, and with contributions by the Instituto de Astrofísica de Canarias, the Institut für Astrophysik Göttingen, and the Astronomical Institute of the Academy of Sciences of the Czech Republic.Science contact:
Gabriele Schönherr | idw
Explained: Why water droplets 'bounce off the walls'
27.02.2020 | University of Warwick
Scientists 'film' a quantum measurement
26.02.2020 | Stockholm University
Researchers at the University of Bayreuth have discovered an unusual material: When cooled down to two degrees Celsius, its crystal structure and electronic properties change abruptly and significantly. In this new state, the distances between iron atoms can be tailored with the help of light beams. This opens up intriguing possibilities for application in the field of information technology. The scientists have presented their discovery in the journal "Angewandte Chemie - International Edition". The new findings are the result of close cooperation with partnering facilities in Augsburg, Dresden, Hamburg, and Moscow.
The material is an unusual form of iron oxide with the formula Fe₅O₆. The researchers produced it at a pressure of 15 gigapascals in a high-pressure laboratory...
Study by Mainz physicists indicates that the next generation of neutrino experiments may well find the answer to one of the most pressing issues in neutrino physics
Among the most exciting challenges in modern physics is the identification of the neutrino mass ordering. Physicists from the Cluster of Excellence PRISMA+ at...
Fraunhofer researchers are investigating the potential of microimplants to stimulate nerve cells and treat chronic conditions like asthma, diabetes, or Parkinson’s disease. Find out what makes this form of treatment so appealing and which challenges the researchers still have to master.
A study by the Robert Koch Institute has found that one in four women will suffer from weak bladders at some point in their lives. Treatments of this condition...
The operational speed of semiconductors in various electronic and optoelectronic devices is limited to several gigahertz (a billion oscillations per second). This constrains the upper limit of the operational speed of computing. Now researchers from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg, Germany, and the Indian Institute of Technology in Bombay have explained how these processes can be sped up through the use of light waves and defected solid materials.
Light waves perform several hundred trillion oscillations per second. Hence, it is natural to envision employing light oscillations to drive the electronic...
Most natural and artificial surfaces are rough: metals and even glasses that appear smooth to the naked eye can look like jagged mountain ranges under the microscope. There is currently no uniform theory about the origin of this roughness despite it being observed on all scales, from the atomic to the tectonic. Scientists suspect that the rough surface is formed by irreversible plastic deformation that occurs in many processes of mechanical machining of components such as milling.
Prof. Dr. Lars Pastewka from the Simulation group at the Department of Microsystems Engineering at the University of Freiburg and his team have simulated such...
12.02.2020 | Event News
16.01.2020 | Event News
15.01.2020 | Event News
27.02.2020 | Life Sciences
27.02.2020 | Health and Medicine
27.02.2020 | Physics and Astronomy