International Journal on Science and Technology

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A STUDY ON THE MORNING AND EVENING TIME VARIATION OF ATMOSPHERIC TURBULENCE OVER GUWAHATI

Author(s) Mr. Dhrubajyoti Choudhury, Mr. Dhiman Barua, Mr. Dhanjit Medhi
Country India
Abstract The process of turbulence generation is always associated with rapid fluctuation of the air density which in turn can modulate the radio refractive index of the atmosphere. Radio waves propagating through such a turbulent medium may undergo severe attenuation. Intensity of the atmospheric turbulence is generally expressed as the refractive index structure constant, generally termed as Cn2. The knowledge of refractive index structure constant (Cn2) at different atmospheric regimes is therefore fundamental to determine the impact of turbulence on the signals propagating in the troposphere. Atmospheric turbulence generally regarded as small-scale irregular air motions characterized by winds that vary in speed and direction. In our work, efforts are made to characterize the morning and evening time variation of refractive index structure constant (Cn2) over Guwahati using radio sonde data. For this work , morning and evening time records of atmospheric sounding for few selected days of 2019 will be utilized to estimate the Cn2 parameter from surface to the higher altitudes. Further, through this work, the possible mechanisms that may lead to the variations in the vertical turbulence characteristics over this region will also be investigated.
Keywords Attenuation, Refractive index structure constant, Atmospheric turbulence, Time variation, Radio sonde data, High altitude
Field Physics
Published In Volume 16, Issue 3, July-September 2025
Published On 2025-09-17
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