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Boundary-Layer Meteorology

, 141:325 | Cite as

Atmospheric Surface-Layer Response to the Annular Solar Eclipse of 15 January 2010 over Thiruvananthapuram, India

  • D. Bala SubrahamanyamEmail author
  • T. J. Anurose
  • Mannil Mohan
  • M. Santosh
  • N. V. P. Kiran Kumar
  • S. Sijikumar
  • S. S. Prijith
  • Marina Aloysius
Research Note

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.

Keywords

Annular solar eclipse Atmospheric surface layer Irradiance Sensible heat flux Stability parameter Turbulence 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • D. Bala Subrahamanyam
    • 1
    Email author
  • T. J. Anurose
    • 1
  • Mannil Mohan
    • 1
  • M. Santosh
    • 1
  • N. V. P. Kiran Kumar
    • 1
  • S. Sijikumar
    • 1
  • S. S. Prijith
    • 1
  • Marina Aloysius
    • 1
  1. 1.Space Physics Laboratory, Vikram Sarabhai Space Centre, Department of Space, Government of IndiaIndian Space Research OrganizationThiruvananthapuramIndia

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