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  • January to March 2024 Article ID: NSS8783 Impact Factor:7.67 Cite Score:139 Download: 14 DOI: https://doi.org/ View PDf

    Reconstructing the Ion Plasma Characteristics Based on Current Measurements Through the Application of Mathematical Techniques

      Dr. Raginee Pandey
        Assistant Professor, Department of Physics, Govt. D.B. Girls P.G. College, Raipur (C.G.)
      Dr. Manish Kumar Pandey
        Associate Professor, Department of Mathematics, MATS University, Gullu, Arang, Raipur (C.G.)
      Dr. Sanjay Pandey
        Professor, Department of Applied Physics, ISBM University, Gariybandh (C.G.)

    • Abstract: The Ion Plasma Analyzer (IAP) is a key instrument in the Demeter ionospheric mission, designed to measure thermal ion flows at around 750 km altitude. It has two components: (i) the Retarding Potential Analyzer (APR), which measures the energy distribution of ion plasma, and (ii) the Velocity Direction Analyzer (ADV), which determines the angle of ion flow relative to the analyzer axis. To improve the accuracy and speed of ion plasma parameter estimates, we revisited the mathematical models and addressed instrumental limitations such as finite angular aperture, grid transparency, potential depression between grid wires, and ion losses between the diaphragm and collector. Simple analytical expressions were developed to match the current measurements from the APR and ADV, showing strong agreement with numerical solutions. These model functions allow for precise determination of ion concentrations and arrival angles, even in complex multi-species plasma environments. The analysis is based on ionospheric conditions predicted by the IRI model.

    Keywords:Ion Plasma Analyzer (IAP), Retarding Potential Analyzer (APR), Velocity Direction Analyzer (ADV).