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Statistical Distribution of Dawnside Auroral Polarization Streams
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Statistical Distribution of Dawnside Auroral Polarization Streams
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Journal Article
Statistical Distribution of Dawnside Auroral Polarization Streams
2025
Overview
Dawnside auroral polarization streams (DAPS) are fast eastward flows in the dawn convection cell of Earth's ionosphere. With a steep flow gradient near the interface between Region 1 and 2 currents and a peak poleward of it, DAPS were suggested to be responsible for instabilities and dramatic events in the magnetosphere‐ionosphere (M‐I) system. To predict these events, it is important to investigate when and where DAPS prefer to occur and how they are related to other M‐I phenomena. We conduct this investigation statistically using 10 years of Swarm data and find that DAPS under sunlit and dark ionospheric conditions exhibit different dependencies on magnetic local times and geomagnetic activities, reflecting a complicated interplay between magnetotail dynamics and ionospheric conductance. The statistical results also reveal a strong correlation between DAPS and embedded Region 2 currents. These findings provide new insights into the DAPS generation mechanism. Plain Language Summary The dawnside auroral polarization stream is a unique type of plasma wind in Earth′s high‐latitude ionosphere. These streams play a key role in shaping the aurora and affecting how energy enters from space into the atmosphere. In this study, we explore when and where these streams are most likely to occur. The results not only help us better understand what causes them but also increase the ability to predict space weather events related to them, such as variations in atmosphere temperature. Key Points Dawnside auroral polarization streams (DAPS) appear more often inside a dark ionosphere than a sunlit ionosphere The occurrence of DAPS depends on magnetic local time and geomagnetic activity in a complicated yet comprehensible manner The signature of embedded Region 2 currents is more prominent when DAPS are present
Publisher
John Wiley & Sons, Inc,Wiley
