Morphological Comparison of Standard Scintillation Indices at the Canadian Arctic During a Strong Geomagnetic Storm: A Case Study

Abstract In recent decades, the scintillation phenomenon at high‐latitudes characterized by “Phase without Amplitude” has become increasingly prevalent. Consequently, there is a growing tendency to focus only on the phase scintillation index in the polar region. Nevertheless, dealing with the scintillation issue solely based on the stereotype is inappropriate. In this study, we present a case study to certificate and compare the disturbances of two types of standard scintillation indices over the Canadian Arctic during a strong geomagnetic storm on 1 December 2023. Overall, all scintillation indices were elevated vigorously on the polar cap and auroral oval almost at the same time. Specifically, with the appearance of strong total electron content (TEC) gradient and fast flow, the amplitude scintillation indices () raised clearly above the background (0.05), often exceeding 0.2, however, which is still weaker than that of phase scintillation indices (, usually >0.4 radians). It evidences that at high latitudes is not so faint as to be negligible. Moreover, the less variability observed in relative to may be partially due to the Fresnel filtering effect. Therefore, the study presents the distinct disturbances of two types of scintillation indices over the polar region, challenging the popular impression of the “Phase without Amplitude” scintillation phenomenon at high latitudes and also reminding us to take a serious look at them.