Daytime turbulence strength profile measurement at Kodaikanal Observatory
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913436974186496 |
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| author | Subramanian, Saraswathi Kalyani Rengaswamy, Sridharan Deshmukh, Prasanna Gajanan Nair, Binukumar G. S, Mahesh Babu |
| author_facet | Subramanian, Saraswathi Kalyani Rengaswamy, Sridharan Deshmukh, Prasanna Gajanan Nair, Binukumar G. S, Mahesh Babu |
| contents | The Indian Institute of Astrophysics (IIA) is developing a Multi-Conjugate Adaptive Optics (MCAO) system for the Kodaikanal Tower Telescope (KTT). In this context, we have measured the daytime turbulence strength profile at the Kodaikanal Observatory. The first method based on wavefront sensor (WFS) images, called S-DIMM+ (Solar-Differential Image Motion Monitor+), was used to estimate the higher altitude turbulence up to a height of 5 - 6 km. The second method used balloon-borne temperature sensors to measure the near-Earth turbulence up to 350 m. We also carried out simulations to validate the performance of our system. We report the first-ever daytime turbulence strength profile measurements at the observatory. We have identified the presence of a strong turbulence layer about 3 km above the observatory. The measured near-Earth turbulence matches the trend that is expected from the model for daytime component of turbulence and gives an integrated $r_0$ of about 4 cm at 500 nm. This is consistent with earlier seeing measurements. This shows that a low-cost setup with a small telescope and a simple array of temperature sensors can be used for estimating the turbulence strength profile at the site. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_14027 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Daytime turbulence strength profile measurement at Kodaikanal Observatory Subramanian, Saraswathi Kalyani Rengaswamy, Sridharan Deshmukh, Prasanna Gajanan Nair, Binukumar G. S, Mahesh Babu Instrumentation and Methods for Astrophysics The Indian Institute of Astrophysics (IIA) is developing a Multi-Conjugate Adaptive Optics (MCAO) system for the Kodaikanal Tower Telescope (KTT). In this context, we have measured the daytime turbulence strength profile at the Kodaikanal Observatory. The first method based on wavefront sensor (WFS) images, called S-DIMM+ (Solar-Differential Image Motion Monitor+), was used to estimate the higher altitude turbulence up to a height of 5 - 6 km. The second method used balloon-borne temperature sensors to measure the near-Earth turbulence up to 350 m. We also carried out simulations to validate the performance of our system. We report the first-ever daytime turbulence strength profile measurements at the observatory. We have identified the presence of a strong turbulence layer about 3 km above the observatory. The measured near-Earth turbulence matches the trend that is expected from the model for daytime component of turbulence and gives an integrated $r_0$ of about 4 cm at 500 nm. This is consistent with earlier seeing measurements. This shows that a low-cost setup with a small telescope and a simple array of temperature sensors can be used for estimating the turbulence strength profile at the site. |
| title | Daytime turbulence strength profile measurement at Kodaikanal Observatory |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2407.14027 |