Atmospheric Surface-Layer Response to the Annular Solar Eclipse of 15 January 2010 over Thiruvananthapuram,India |
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Authors: | D Bala Subrahamanyam T J Anurose Mannil Mohan M Santosh N V P Kiran Kumar S Sijikumar S S Prijith Marina Aloysius |
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Institution: | (1) Space Physics Laboratory, Vikram Sarabhai Space Centre, Department of Space, Government of India, Indian Space Research Organization, Thiruvananthapuram, 695 022, Kerala, India |
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Abstract: | On 15 January 2010, Thiruvananthapuram in India (8.5°N, 76.9°E) witnessed one of the longest possible noontime annular solar
eclipses spanning a period of about 7 min centred at 1314 local time. Here, we present a case study on the behaviour of the
atmospheric surface layer by comparing the eclipse-induced observations with similar measurements recorded on cloud-free/clear-sky
days. During the peak period of the eclipse, the incoming solar irradiance was reduced by 87% of its normal values, resulting
in an air-temperature decrease near the surface of 1.2°C in association with a significant reduction in turbulent kinetic
energy, momentum flux and sensible heat flux. The rate of instantaneous decay in solar radiation and sensible heat flux from
the first contact of the eclipse to its annularity was greater than that seen during normal evening hours. |
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