Praveen Tyagi

Geoeffectiveness of Interplanetary Storm Drivers during Solar Cycle 25 through June 2026: A Comparative Study of ICMEs, Sheath Regions, and Corotating Interaction Regions

Praveen Tyagi & V. K. Mishra · Physical Science International Journal · 2026

This study presents a cycle-to-date classification and geoeffectiveness analysis of the interplanetary drivers of geomagnetic storms during Solar Cycle 25 (SC25), from December 2019 to 24 June 2026. Hourly OMNI solar-wind plasma and interplanetary magnetic-field data were analyse...

Open access Research Article 10.9734/psij/2026/v30i5967

Ground-Level Enhancement 77 of 11 November 2025: Relativistic Solar-Particle Acceleration, an Extreme Geomagnetic Storm, and Forbush Decreases Driven by Solar Active Region 4274

V. K. Mishra & Praveen Tyagi · Physical Science International Journal · 2026

The rising phase of Solar Cycle 25 has produced several extreme space-weather episodes driven by explosive magnetic reconnection in the solar atmosphere. This study presents an integrated, multi-parameter analysis of the eruptive sequence of 9–14 November 2025 originating from th...

Open access Research Article 10.9734/psij/2026/v30i4961