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- Title
Longitudinal Evolution of the Velocity of Subauroral Polarization Streams (SAPS) in Different Phases of Magnetic Storms: SuperDARN Observations.
- Authors
Zhang, Qiang; Liu, Yong C.‐M.; Zhang, Q.‐H.; Xing, Zan‐Yang; Ma, Yu‐Zhang
- Abstract
Investigations of the evolution of subauroral polarization streams (SAPS) are important to understand the plasma transport processes in the polar ionosphere. In this article, three cases of SAPS evolution are analyzed using the observations made by the Super Dual Auroral Radar Network mid‐latitude radar chain, Special Sensor Ultraviolet Spectrographic Imagers instrument and Active Magnetosphere and Planetary Electrodynamics Response Experiment. The three cases occur in the main phase, beginning of recovery phase and end of recovery phase of three magnetic storms. The cases last from 1.5 to 2 h during 1800–0300 MLT (magnetic local time). The observations show that the SAPS velocity evolution is strongly controlled by the ring current injection during the storm main phase. The responses of SAPS velocity are prompt and appear first near the dusk side and then expand to the night side. Besides, the SAPS velocity has a good linear correlation (R = −0.85) with SYMH index during the evolution of the magnetic storm. The SAPS velocity also shows dependence on the AE index and interplanetary magnetic field (IMF) Bz. The correlations between SAPS velocity and AE/Bz increase with the decay of the magnetic storm. However, the effect of substorm/IMF on SAPS velocity is not strong compared to that of the magnetic storm. Key Points: Increasing subauroral polarization streams (SAPS) velocity expands longitudinally from post‐dusk side in main phase and shrinks back to post‐dusk side in recovery phaseIn the main phase, SAPS T‐Slope has similar time profile with SYMH index and ring current strongly controls the velocity evolutionGood linear correlations exist between SAPS velocity and SYMH/AE/Bz while the correlations are different in different phases
- Subjects
PLASMA transport processes; POLAR ionosphere; ELECTRODYNAMICS; MAGNETOSPHERE; IONOSPHERE
- Publication
Journal of Geophysical Research. Space Physics, 2021, Vol 126, Issue 9, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2021JA029340