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    • Keywords


      Ionospheric time delay; scintillation; TEC; geomagnetic storm.

    • Abstract


      The purpose of this work is to investigate the effect of magnetic activity on ionospheric time delay at low latitude Station Bhopal (geom. lat. 23.2°N, geom. long. 77.6°E) using dual frequency (1575.42 and 1227.60 MHz) GPS measurements. Data from GSV4004A GPS Ionospheric Scintillation and TEC monitor (GISTM) have been chosen to study these effects. This paper presents the results of ionospheric time delay during quiet and disturbed days for the year 2005. Results show that maximum delay is observed during quiet days in equinoxial month while the delays of disturbed period are observed during the months of winter. We also study the ionospheric time delay during magnetic storm conditions for the same period. Results do not show any clear relationship either with the magnitude of the geomagnetic storm or with the main phase onset (MPO) of the storm. But most of the maximum ionospheric time delay variations are observed before the main phase onset (MPO) or sudden storm commencement (SSC) as compared to storm days.

    • Author Affiliations


      Soumi Bhattacharya1 Smita Dubey1 Rajesh Tiwari1 P. K. Purohit2 A. K. Gwal1

      1. Space Science Laboratory, Department of Physics, Barkatullah University, Bhopal 462 026, India.
      2. National Institute of Technical, Teacher Training and Research, Shamla Hill, Barkatullah University, Bhopal 462 026, India.
    • Dates

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