Siberian Solar Radio Telescope (SSRT)

Russia / Burjatija / Kyren /
 science, radio telescope

The Siberian Solar Radio Telescope (SSRT) is among the largest astronomical instruments. It is located in a wooded picturesque valley separating two mountain ridges of the Eastern Sayan Mountains and Khamar-Daban, 220 km from Irkutsk. It is a crossed interferometer, consisting of two arrays of 128x128 parabolic antennas 2.5 meters in diameter each, spaced equidistantly at 4.9 meters and oriented in the E-W and N-S directions. The main maxima of the radio telescope's multidirectional beam are arranged at intervals in some excess of the Sun's apparent size at the instrument's working wavelengths l = 5,2 sm. The length of each linear baselines of the interferometer is 622.3 meters.

The SSRT is a special-purpose solar radio telescope designed for studying solar activity in the microwave range (5.7 GHz) where the processes occuring in the solar corona are accessible to observation over the entire solar disk. The SSRT sensitivity is such that it is possible to observe active regions at all stages of their development, at the background of the emission of an undisturbed solar atmosphere. Signal accumulation in the radio telescope's full reception band is used to obtain radio images of faint features in the solar atmosphere. Fast varying emission of flares is recorded at additive linear interferometers comprising the SSRT.

Step-by-step commissioning of the radio telescope was begun in the spring of 1981 and completed in 1984. With completion of adjustments of the N-S line in 1985, the SSRT initiated an all-weather monitoring of solar activity in the one-dimensional mode with an angular resolution as high as 15" using both linear interferometers. The team of authors was awarded a RF Government Premium in the field of science and technology for the year 1996.

The SSRT was put on the list of Russia's unique facilities.

Since 1992, the SSRT has been involved in regular investigations of fine-structure active phenomena, such as spikes. Sine 1993, the time resolution has been 15 ms.

During 1995-1996, the SSRT incorporated two two-dimemsional modes: the projected correlation mode, and the combined additive-correlation mode. Two-dimensional mapping is done concurrently with one-dimensional images obtained in the additive mode. The correaltion mode with high sensitivity permits low-constrast features on the Sun to be investigated. The additive-correlation mode ensures, at a sacrifice in sensitivity, a siomultaneous construction of radio maps with a fast rcording in the one-dimensional mode at the time resolution of 56 ms, which is important in observations of active processes when a reduction in sensitivity is not critical and the active region image can be obtained every minute.
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Coordinates:   51°45'33"N   102°13'9"E
This article was last modified 14 years ago