Observations of the atmospheric surface layer parameters over a semi arid region during the solar eclipse of August 11th, 1999 |
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| Authors: | Praveena Krishnan P K Kunhikrishnan S Muraleedharan Nair Sudha Ravindran Radhika Ramachandran D B Subrahamanyam M Venkata Ramana |
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| Institution: | (1) Space Physics Laboratory, Vikram Sarabhai Space Centre, 695 022 Thiruvananthapuram, India |
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| Abstract: | This paper discusses the observations of the Atmospheric Surface Layer (ASL) parameters during the solar eclipse of August
11th, 1999. Intensive surface layer experiments were conducted at Ahmedabad (23‡21′N, 72‡36′E), the western part of India,
which was close to the totality path. This rare event provided by nature is utilised to document the surface layer effects
during the eclipse period using measurements of high frequency fluctuations of temperature, tri-axial wind components as well
as mean parameters such as temperature, humidity, wind speed and subsoil temperature. Analysis showed that during the eclipse
period, the turbulence parameters were affected leading to the suppression of the turbulence process, the main dynamic process
in the atmospheric boundary layer, while the mean parameters showed variations within the natural variability of the observational
period. The spectra of the wind components and temperature indicated decrease in spectral power by one order in magnitude
during the eclipse period. The rate of dissipation of turbulent kinetic energy is found to decrease by more than one order
during the eclipse period. The stability parameter showed a change from unstable to stable condition during the period of
eclipse and back to unstable condition by the end of eclipse |
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| Keywords: | Atmospheric surface layer solar eclipse turbulence spectrum dissipation rate |
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