Multi-frequency investigation of height-dependent drift variability of the sporadic E (Es) layers in the polar region using Canadian Advanced Digital Ionosonde
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Date
2025-10
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University of New Brunswick
Abstract
Ionospheric plasma motion and density gradients affect radio wave propagation by causing irregularities that lead to rapid fluctuations and alter signal characteristics. While F - region drift (convection) is well understood in the Polar Cap, plasma drift in the lower ionosphere, especially the E region (90-150 km altitude), remains poorly understood due to limited measurements. To address this gap, we analyzed ionospheric motion during Sporadic E conditions to investigate the morphology and variability of drift in the 100-150 km region of the polar cap. The three components of drift (vertical, zonal, meridional) over Pond Inlet (72.70°N, 77.95°W) were studied using Doppler interferometry with the Canadian Advanced Digital Ionosonde (CADI). Drift measurements at 2.73, 4, 5, and 6 MHz were analyzed. Gaussian fits showed no significant differences for 2.73-5 MHz, while 6 MHz data exhibited greater variability (up to 500 m/s). Case studies revealed factors influencing E-region drift.
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NATURAL SCIENCES::Physics