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    • Characteristics of low latitude ionospheric E-region irregularities linked with daytime VHF scintillations measured from Varanasi

      K Patel A K Singh R P Patel R P Singh

      Volume 118 Issue 6 December 2009 pp 721-732

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/118/06/0721-0732

    • Keywords

       

      Daytime scintillations; ionospheric E-region irregularities; ionospheric propagation; wave propagation.

    • Abstract

       

      VHF amplitude scintillations recorded during the daytime period from January 1991 to December 1993, April 1998 to December 1999 and January 2008 to December 2008 at low latitude station Varanasi (geographic lat. = 25° 15′N; long. = 82° 59′E; geomagnetic lat. = 14° 55′N, long. = 154°E, dip angle = 37.3°, sub-ionospheric dip = 34°) have been analyzed to study the behaviour of ionospheric E-region irregularities during the active solar and magnetic periods. The autocorrelation functions, power spectral densities, signal de-correlation times are computed to study the temporal features of ionospheric E-region irregularities linked with daytime scintillations. Derived spectral index ranges between −2 and −9. Assuming velocity of irregularities, the characteristic lengths of the E-region irregularities are estimated. We have estimated the minimum and maximum range of scale length of sporadic-E ($E_s$) irregularities to be observed over Varanasi. These results are in close agreement with those reported from this latitude region.

    • Author Affiliations

       

      K Patel1 A K Singh1 R P Patel2 R P Singh1 3

      1. Atmospheric Research Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221 005, India.
      2. Department of Physics, M.M.H. P.G. College, Ghaziabad, India.
      3. Veer Kunwar Singh University, Ara, Bihar, India.

    • Dates

       
      Published
      December 2009
      Manuscript received
      5 June 2009
      Manuscript revised
      15 September 2009
      Accepted
      16 September 2009

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