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Browsing by Author "Angchuk, D"

Browsing by Author "Angchuk, D"

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  • A 10-m class national large optical-IR telescope 
    Anupama, G. C; Maheswar, G; Sriram, S; Sivarani, T; Parihar, P. S; Nagabhushana, S; Angchuk, D; Barway, Sudhanshu; Bhatt, B. C; Banyal, R. K; Basheer, Alikhan; Prasanna, Deshmukh; Divakar, D. K; Dorjai, T; Goswami, A; Govinda, K. V; Jorphail, S; Kamath, U. S; Kemkar, P. M. M; Mahay, T. T; Muneer, S; Muthumariappan, C; Shantikumar, N. S; Pandey, G; Reddy, B. E; Sahu, D. K; Sandeep, D. S; Ramya, S; Stalin, C. S; Subramanian, S; Tsewang, Stanzin; Subramaniam, A (Indian Academy of Science, 2022-06)
    An observatory class national large optical-IR telescope (NLOT), is proposed to be built and located in the country. The telescope consists of a 10–12 m segmented primary. In order to cater to a diversity of observational ...
  • The 50cm robotic telescope: control system upgrade and automation 
    Stanzin, Tsewang; Jorphail, S; Parihar, P. S; Angchuk, D; Dorjai, T; Gyalson, T; Mahey, T. T; Dorjay, Padma; Dorjay, Phuntsok; Phunchok, Tsewang; Pamber, Tashi; Stanzin, Urgain; Angdu, Skalzang (SPIE-The International Society for Optical Engineering, 2022-08)
    We describe the details into the design and development of a low-cost yet efficient telescope control system (TCS) and observatory control software (OCS) for the 50cm telescope at the Indian Astronomical Observatory. The ...
  • Activity of the first interstellar comet 2I/Borisov around perihelion: results from Indian observatories 
    Aravind, K; Ganesh, Shashikiran; Venkataramani, Kumar; Sahu, D. K; Angchuk, D; Sivarani, T; Unni, Athira (Oxford University Press on behalf of the Royal Astronomical Society, 2021-04)
    Comet 2I/Borisov is the first true interstellar comet discovered. Here, we present results from observational programs at two Indian observatories, 2 m Himalayan Chandra Telescope at the Indian Astronomical Observatory, ...
  • Astronomical site survey report on dust measurement, wind profile, optical turbulence, and their correlation with seeing over IAO-Hanle 
    Shantikumar, N. S; Kathiravan, S; Parihar, P. S; Larson, E. J. L; Sharika Mohanan; Angchuk, D; Jorphel, Sonam; Rangarajan, K. E; Prabhu, K (Springer Netherlands, 2017-04)
    The present work discusses astronomical site survey reports on dust content, vertical distribution of atmospheric turbulence, precipitable water vapor (PWV), surface and upper-air data, and their effects on seeing over the ...
  • Atmospheric opacity using 220 GHz (1.36 mm) radiometer data and water vapor trends over Indian Astronomical Observatory (IAO), Hanle 
    Shantikumar, N. S; Sethulakshmy, E. S; Jade, S; Shrungeshwara, T. S; Vivek, C. G; Angchuk, D; Prabhu, T. P; Mahay, T. T (Elsevier B.V., 2020-10-15)
    The present work reports atmospheric opacity at 220 GHz over Indian Astronomical Observatory (IAO)-Hanle during 2006 to 2018. The opacity data were derived from the radiometric measurement of sky-brightness temperature as ...
  • Characteristics of multi-layer clouds observed using ceilometer observations over Leh-Ladakh: A high-altitude cold desert region 
    Shah, Ruchita; Sharma, S; Kamat, Dharmendra; Kumar, Kondapalli Niranjan; Kumar, Prashant; Shantikumar, N. S; Angchuk, D; Srivastava, Rohit (Elsevier B.V, 2026-01)
    The Leh-Ladakh region is a high-altitude cold desert (3255 m above mean sea level), located under the rain shadow of the Himalayas, display various cloud features crucial to understand the extreme weather conditions. Global ...
  • Characterization of aerosol optical and radiative properties at Leh, located over the climate sensitive Hindu Kush Himalayan region using sky radiometer observation 
    Shantikumar, N. S; Mukhopadhyay, Swagata; Madhavan, B. L; Srivastava, A. K; Sharma, Som K; Singh, Amarendra; Jorphel, Sonam; Angchuk, D; Mahay, T. T (Elsevier B.V, 2025-07-15)
    Aerosol optical and radiative properties over the Leh Ladakh, located in the climate sensitive Hindu Kush Himalayan region are examined using one year measurements from a newly installed sky radiometer from July 2023 ...
  • Hanle echelle spectrograph: design and performance 
    Sriram, S; Amit Kumar; Arun Surya; Sivarani, T; Giridhar, S; Kathiravan, S; Anand, M. N; Jones, D; Grobler, D; Jakobsson, R; Anantha, Ch; Athira Unni; Angchuk, D; Tsewang, D; Gyalson, T (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Hanle echelle spectrograph (HESP) is a high resolution, bench mounted, fiber-fed spectrograph at visible wavelengths. The instrument was recently installed at the 2m Himalayan Chandra Telescope (HCT), located at Indian ...
  • India's First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope 
    Kumar, Harsh; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu; Basu, Judhajeet; Deshmukh, Kunal; De, Kishalay; Dutta, Anirban; Fremling, Christoffer; Iyer, Hrishikesh; Jassani, Adeem; Joharle, Simran; Karambelkar, Viraj; Khandagale, Maitreya; Krishna, K Adithya; Kulkarni, Sumeet; Mate, Sujay; Patil, Atharva; Phanindra, D. V. S; Samantaray, Subham; Sharma, Kritti; Sharma, Yashvi; Shenoy, Vedant; Singh, Avinash; Srivastava, Shubham; Swain, Vishwajeet; Waratkar, Gaurav; Angchuk, D; Dorjay, Padma; Dorjai, T; Gyalson, T; Jorphail, S; Mahay, T. T; Norbu, Rigzin; Sharma, Tarun Kumar; Stanzin, Jigmet; Stanzin, Tsewang; Stanzin, Urgain (American Astronomical Society, 2022-09-01)
    We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time-domain astronomy. The telescope is equipped with a 4k back-illuminated camera that gives a 0fdg82 field of ...
  • Installation of solar chromospheric telescope at the Indian Astronomical Observatory, Merak 
    Ravindra, B; Prabhu, K; Thulasidharen, K. C; Rajalingam, M; Sagayanathan, K; Kamath, P. U; Dorjey, N; Angchuk, D; Kemkar, P. M. M; Dorjai, T; Banyal, R. K (Indian Academy of Sciences, 2018-10)
    We report the observations of the solar chromosphere from a newly commissioned solar telescope at the incursion site near Pangong Tso lake in Merak (Leh/Ladakh). This new Hα telescope at the Merak site is identical to the ...
  • Long-lived atmospheric trace gases measurements in flask samples from three stations in India 
    Lin, X; Indira, N. K; Ramonet, M; Delmotte, M; Ciais, P; Bhatt, B. C; Reddy, M. V; Angchuk, D; Balakrishnan, S; Jorphail, S; Dorjai, T; Mahey, T. T; Patnaik, S; Begum, M; Brenninkmeijer, C; Durairaj, S; Kirubagaran, R; Schmidt, M; Swathi, P. S; Vinithkumar, N. V; Kwok, C. Y; Gaur, V. K (Published by Copernicus Publications on behalf of the European Geosciences Union, 2015-03)
    With the rapid growth in population and economic development, emissions of greenhouse gases (GHGs) from the Indian subcontinent have sharply increased during recent decades. However, evaluation of regional fluxes of GHGs ...
  • Long-term (2008–2018) aerosol properties and radiative effect at high-altitude sites over western trans-Himalayas 
    Dumka, U. C; Shantikumar, N. S; Kaskaoutis, D. G; Madhavan, B. L; Song, H. -J; Angchuk, D; Jorphail, S (Elsevier B. V, 2020-09-10)
    Analysis of the climatology of aerosol properties is performed over Hanle (4500 m) and Merak (4310 m), two remote-background sites in the western trans-Himalayas, based on eleven years (2008–2018) of sun/sky radiometer ...
  • Low-latitude auroras: insights from 2023 april 23 solar storm 
    Vichare, Geeta; Bhaskar, Ankush; Rawat, Rahul; Yadav, Virendra; Mishra, Wageesh; Angchuk, D; Singh, Anand Kumar (American Astronomical Society, 2024-12-20)
    In 2023 April, a low-latitude aurora observed by the all-sky camera at Hanle, Ladakh, India (33°14'N geographic latitude), generated significant interest. This was the first such aurora recorded from the Indian region in ...
  • Measurements of 220 GHz atmospheric transparency at IAO, Hanle, during 2000-2003 
    Ananthasubramanian, P. G; Yamamoto, S; Prabhu, T. P; Angchuk, D (Astronomical Society of India, 2004-06)
    A 220 GHz tipping radiometer was installed at the Indian Astronomical Observatory (IAO), Hanle (Latitude 32o46'46" N; Longitude 78o57'51" E; Altitude 4500 m, above msl) towards the end of December 1999. The system is in ...
  • Optical observations and dust modelling of comet 156P/Russell-LINEAR 
    Aravind, K; Halder, Prithish; Ganesh, Shashikiran; Sahu, D. K; Serra-Ricart, Miquel; Chambo, Jose J; Angchuk, D; Sivarani, T (Elsevier B.V., 2022-09-01)
    Comet 156P/Russell-LINEAR is a short period Jupiter family comet with an orbital period of 6.44 years. The results from spectroscopic, photometric, polarimetric observations and dust modelling studies are presented here. ...
  • Pointing of HAGAR telescope mirrors 
    Gothe, K. S; Prabhu, T. P; Vishwanath, P. R; Acharya, B. S; Srinivasan, R; Chitnis, V. R; Kamath, P. U; Srinivasulu, G; Saleem, F; Kemkar, P. M. M; Mahesh, P. K; Gabriel, F; Manoharan, J; Dorji, N; Dorjai, T; Angchuk, D; D'souza, A. I; Duhan, S. K; Nagesh, B. K; Rao, S. K; Sharma, S. K; Singh, B. B; Sudersanan, P. V; Thsering, M. T; Upadhya, S. S; Anupama, G. C; Britto, R. J; Cowsik, R; Saha, L; Shukla, A (Springer, 2013-04)
    An array of seven atmospheric Cherenkov telescopes was commissioned at a high altitude site in Hanle in the Ladakh region of the Himalayas. The array called HAGAR has been designed to observe celestial γ-rays of energy ...
  • Retrieval of precipitable water vapor from sun–sky radiometer (POM-01) at 940 nm absorption band: Calibration, measurement and validation 
    Mukhopadhyay, Swagata; Shantikumar, N. S; Uchiyama, Akihiro; Jorphail, S; Vivek, Chiranjeevi G; Shrungeshwara, T. S; Sreedevi, P; Matsunaga, Tsuneo; Sharma, S; Gupta, Pawan; Angchuk, D; Jade, S (Elsevier B.V., 2026-03-01)
    Sun–sky radiometer (model POM-01) is commonly used for studying aerosol optical and physical properties at selected aerosol-specific channels. Although the instrument is equipped with a precipitable water vapor (PWV) channel ...
  • Study of wind pattern at the incursion site of Pangong Tso near merak village 
    Ravindra, B; Sarkar, Deepangkar; Shantikumar, N. S; Tundup, Stanzin; Dorje, N; Angchuk, D; Kesavan, Prabhu; Banerjee, D (Springer Nature, 2025-02)
    This study analyzes twelve years of wind speed and direction data collected at the proposed National Large Solar Telescope (NLST) site near Pangong Tso, Merak village, Leh-Ladakh. A weather station from Campbell Scientifc ...
  • Validation of estimated cloud fraction from MERRA-2 and AIRS data using ground based observation over IAO, Hanle 
    Shantikumar, N. S; Narendra, A; Bhatt, B. C; Prabhu, T. P; Anupama, G. C; Angchuk, D; Jorphail, S (Elsevier B.V, 2020-08-15)
    We report for validation of cloud fraction estimated from high-resolution (hourly) data from MERRA-2 and AIRS instrument aboard NASA’s Aqua satellite during its ascending and descending orbits with hourly ground-based ...

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