Schumann Resonance Frequency Increase Following Recurrent Solar Wind Stream Onsets

Tacza, J. and Sátori, G. and Neska, A. and Raita, T. and Bozóki, T. (2026) Schumann Resonance Frequency Increase Following Recurrent Solar Wind Stream Onsets. Earth and Space Science. (In Press)

Preview

Text Jose1077058_2_merged_1788969573_small.pdf Download (1MB) | Preview

Abstract

Recurrent high-speed streams and corotating interaction regions (HSS/CIRs) are common solar-wind drivers, but their influence on Schumann resonance (SR) frequencies remains poorly constrained. We analyzed 173 threshold-defined HSS/CIR proxy onsets using superposed epoch composites, bootstrap uncertainty, and a month-matched random-epoch null model. At the polar Hornsund station (corrected geomagnetic latitude 74.16°N), the first-mode SR frequency exhibits a positive response on days 0 to +1 relative to onset and is unlikely under the month-matched random-epoch null. A similar positive response appears at the high-latitude Ivalo (65.14°N) and Rovaniemi (63.69°N) stations, with the same ordering under matched-support restriction and a weaker response at lower magnetic latitude. Event-level scaling with baseline-relative Kp, AE, and Vsw impulses shows the clearest organization by Kp, consistent support from AE, and a positive but less diagnostic relation with Vsw. Overall, HSS/CIR proxy onsets are associated with a small but repeatable first-mode SR response.

Actions (login required)

View Item