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Seeing and microthermal measurements near Devasthal top

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dc.contributor.author Stalin, C. S.
dc.contributor.author Sagar, R.
dc.contributor.author Pant, P.
dc.contributor.author Mohan, V.
dc.contributor.author Kumar, B.
dc.contributor.author Joshi, Y. C.
dc.contributor.author Yadav, R. K. S.
dc.contributor.author Joshi, S.
dc.contributor.author Chandra, R.
dc.contributor.author Durgapal, A. K.
dc.contributor.author Uddin, W.
dc.date.accessioned 2009-08-25T05:47:49Z
dc.date.available 2009-08-25T05:47:49Z
dc.date.issued 2001
dc.identifier.citation This article downloaded from ADS Free Online Journal en_US
dc.identifier.uri http://hdl.handle.net/123456789/296
dc.description.abstract Results of the seening measurements carried out near Devasthal top on 43 nights during March to April 1999 are presented. Open air seeing measurements were carried out with the mirror about 2 m above the ground. This, in combination with our earlier reported measurements carried out during October to November 1998 on 37 nights show a median seeing of 1.´´1 and 35% of the time seeing is better than 1.´´0. A trend in the seeing evolution is noticed with better seeing towards the later part of the night. By analysing the temporal evolution of seeing for seeing fluctuations it is found that the mean ratio of two seeing values separated by a time interval of ∆t grows with a time constant of about 17 minutes. To quantify the optical image degradation caused by atmospheric turbulence very near to the ground, microthermal measurements were also simultaneously performed with DIMM observations. Microthermal measurements show that most of the contribution to seeing comes from the 6-12 m slab of the atmosphere with a mean value of 0.´´86. A significant decrease in turbulence over the height of the mast is noticed with a mean value of 0.´´22 for the 12-18 m slab. A seeing of ~0.´´6 can be achieved by locating the telescope at a height of ~13 m above the ground. en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries basi29-39
dc.subject Seeing – atmospheric turbulence – site testing en_US
dc.title Seeing and microthermal measurements near Devasthal top en_US
dc.type Article en_US


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