1/7/2024 0 Comments Sun spotter solar telescopeSpectro-POlarimeter for INfrared and Optical Regions (SPINOR).It was designed to "capture the Fe I 6302 Å and Fe I 15648 Å or He I 10830 linesÅ with maximum efficiency ". It can be optimized to provide simultaneous spectral coverage at visible (3,500 – 10,000 Å) and infrared (9,000 – 24,000 Å) wavelengths through the use of a unique dual-armed design. Up to four spectral lines at visible and infrared wavelengths, covering four different heights in the solar atmosphere, can be observed simultaneously. The instrument samples adjacent slices of the solar surface using four parallel slits to achieve high cadence, diffraction-limited, precision spectropolarimetry. The Facility IR Spectropolarimeter is a multi-slit spectropolarimeter specifically for the Dunn Solar Telescope to study magnetism on the solar surface. Facility InfraRed Spectropolarimeter (FIRS).The four most widely used instruments, often used together in one complex observing set up are: The Dunn Solar Telescope has a rotating optical bench, which can be configured to multiple observing setups, depending on the requirements of the science under study. A unique feature of the telescope is its approach to image derotation: the entire 100-metre-long (330 ft) telescope and 40-foot-diameter (12 m) optics lab, 250 tons total, rotates suspended from a mercury float bearing at the top of the tower.ĭespite the size and weight, much of the telescope can be controlled and monitored from a single control room, off to one side of the main instrument observing table. The optics are evacuated to eliminate distortion due to convection in the telescope that would otherwise be caused by the great heat produced by focusing the light of the sun. The entire optical and mechanical structure of the telescope is longer than a football field and weighs over 250 tons. The bearing, in turn, is hung on three bolts, each only 76 millimeters (3 inches) in diameter. The telescope's entire optical system – from the top of the Tower to the base of its underground portion, plus the 40-foot diameter observing room floor – is suspended from the top of the Tower by a mercury float bearing. The whole building from top to bottom is a single instrument. It then returns to one of six quartz optical windows in the floor of an optical laboratory at ground level. The lowest excavated point (the bottom of the sump) is 228 feet (69.5 m) below ground. The optical path starts at a heliostat on top of a 136-foot-tall (41 m) tower and continues 193 feet (58.8 m) more underground to the primary mirror. Like an iceberg, only a part of the telescope's bulk is visible above ground. Scientists and engineers use the Dunn to investigate a range of solar activities, often in concert with satellites or rocket launches, and to develop new technologies for the 4-meter Daniel K. It has two high-order adaptive optics benches to compensate for blurring by Earth's atmosphere. With a horizontal rotating 40-foot-wide observing platform, such that instruments do not have to be mounted on the telescope itself, the Dunn Solar Telescope continues to offer a versatile, user-friendly setup. The telescope was inaugurated as the world's premier high spatial resolution optical solar telescope in 1969. These observations allow solar astronomers worldwide to obtain a better understanding of the Sun. The Dunn Solar Telescope specializes in solar high-resolution imaging and spectroscopy. The view from far above the observation room
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