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Solar Flux Dependence of Coherence Scales in Scintillation Patterns Produced by Esf Irregularities : Volume 23, Issue 10 (30/11/2005)

By Engavale, B.

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Book Id: WPLBN0003980097
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Solar Flux Dependence of Coherence Scales in Scintillation Patterns Produced by Esf Irregularities : Volume 23, Issue 10 (30/11/2005)  
Author: Engavale, B.
Volume: Vol. 23, Issue 10
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2005
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Jeeva, K., Bhattacharyya, A., Nair, K. U., & Engavale, B. (2005). Solar Flux Dependence of Coherence Scales in Scintillation Patterns Produced by Esf Irregularities : Volume 23, Issue 10 (30/11/2005). Retrieved from http://worldlibrary.in/


Description
Description: Indian Institute of Geomagnetism, Kalamboli Highway, Kalamboli - 410 218 New Panvel, India. The coherence scale length, defined as the 50% decorrelation scale length along the magnetic east-west direction, in the ground scintillation pattern obtained at a dip equatorial location, due to scattering of VHF radio waves by equatorial spread F (ESF) irregularities, is calculated, using amplitude scintillation data recorded by two spaced receivers. The average east-west drift of the ground scintillation pattern, during the pre- and post-midnight periods, also calculated from the same observations, shows an almost linear increase with 10.7-cm solar flux. In the present paper the variability of the drift is automatically taken into account in the calculation of the coherence scale length of the ground scintillation pattern. For weak scintillations, the coherence scale depends on the Fresnel scale, which varies with the height of the irregularity layer, and also on the spectral index of the irregularity power spectrum. It is found that for weak scintillations, the coherence scales are much better organized according to the 10.7-cm solar flux, during the pre-midnight period, than during the post-midnight period, with a general trend of coherence scale length increasing with 10.7-cm solar flux except for cases with F 10.7-cm solar flux <100. This indicates that, during the initial phase of ESF irregularity development, the irregularity spectrum does not have much variability while further evolution of the spatial structure in ESF irregularities is controlled by factors other than the solar flux.

Summary
Solar flux dependence of coherence scales in scintillation patterns produced by ESF irregularities

 

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