干旱区生态环境知识资源中心(Arid): Seeing Measurements with the Merak H alpha Telescope

Arid

DOI	10.1007/s11207-021-01807-3
	Seeing Measurements with the Merak H alpha Telescope
	Vishnu, Unni. C.; Rengaswamy, Sridharan; Ravindra, B.; Prabhu, K.
通讯作者	Vishnu, UC (corresponding author), Indian Inst Astrophys, Bangalore, Karnataka, India.
来源期刊	SOLAR PHYSICS
ISSN	0038-0938
EISSN	1573-093X
出版年	2021
卷号	296 期号:4
英文摘要	The parameter-search method (PSM) established by Rengaswamy, Ravindra, and Prabhu (Solar Phys. 294, 5, 2019) for measuring the terrestrial atmospheric seeing from long-exposure solar H alpha images is further validated - through simulations - to include the effects of i) intermediate exposure-time, exposures that are neither as small as 1 to 20 ms used in solar speckle imaging in the visible nor as long as 1 second; ii) under-sampling of the data (with respect to the telescope's diffraction-limit), and iii) non-ideal telescope point spread function. It is then applied to a large dataset to obtain the statistics of Fried's parameter r(0) at Merak: a cold desert in the Himalayas. The bias due to intermediate exposure is well within the error budget. Under-sampling results in an underestimation of r(0) only when the seeing-limited point spread function is sampled at a rate worse than two pixels per seeing-limit, implying that r(0) estimated in the low-resolution mode is unreliable beyond r(0) = 10 cm. The non-ideal telescope point spread function tends to reduce the estimated r(0)-values significantly only when the RMS wave-front error of the aberrated pupil is worse than lambda/14. The median seeing at Merak estimated from data spanning over five months is 2.7 arcseconds.
英文关键词	Atmospheric Seeing Chromosphere
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000639852100001
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351794
作者单位	[Vishnu, Unni. C.; Rengaswamy, Sridharan; Ravindra, B.; Prabhu, K.] Indian Inst Astrophys, Bangalore, Karnataka, India
推荐引用方式 GB/T 7714	Vishnu, Unni. C.,Rengaswamy, Sridharan,Ravindra, B.,et al. Seeing Measurements with the Merak H alpha Telescope[J],2021,296(4).
APA	Vishnu, Unni. C.,Rengaswamy, Sridharan,Ravindra, B.,&Prabhu, K..(2021).Seeing Measurements with the Merak H alpha Telescope.SOLAR PHYSICS,296(4).
MLA	Vishnu, Unni. C.,et al."Seeing Measurements with the Merak H alpha Telescope".SOLAR PHYSICS 296.4(2021).