| Name: Dr. Prithvi Raj Singh |
| Affiliation: Department of Physics, University of Allahabad |
| Conference ID: ASI2026_840 |
| Title: Variations of Solar wind Plasma and Interplanetary magnetic field during Solar Cycles 22–24 |
| Abstract Type: Poster |
| Abstract Category: Sun, Solar System, Exoplanets, and Astrobiology |
| Author(s) and Co-Author(s) with Affiliation: Prithvi Raj Singh(Department of Physics, University of Allahabad, Prayagraj 211003, India), Tarun Kumar Pant(2. Space Physics Laboratory, VSSC, Thiruvananthapuram 695022, India) |
| Abstract: In this paper, we have studied the relationship between the monthly variations of interplanetary magnetic field (IMF), solar wind plasma velocity, and geomagnetic activity index (Ap) during solar cycles 22–24 (1986–2020). The modulation parameter (ξ =V*B) is the product of strength of the interplanetary magnetic field (B) and solar wind plasma velocity (V). We have investigated the periodicities and their evolution using the RobPer periodogram and Continuous Wavelet Transformation methods. The significant periods present in the interplanetary magnetic field (B), geomagnetic activity index (Ap), solar wind plasma velocity (V), and modulation parameter include the Rieger type, semi-annual period, annual period, and quasi-biennial period. In this study, we have found that the rotation rate at the base of the convection zone is ~1.30 years. The modulation parameter appears to be a better representative of the geomagnetic changes than the
other two.
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