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Filters: Author is Liang, Jun  [Clear All Filters]
2019
Authors: Chu Xiangning, Malaspina David, Gallardo‐Lacourt Bea, Liang Jun, Andersson Laila, et al.
Title: Identifying STEVE's Magnetospheric Driver Using Conjugate Observations in the Magnetosphere and on the Ground
Abstract: The magnetospheric driver of strong thermal emission velocity enhancement (STEVE) is investigated using conjugate observations when Van Allen Probes' footprint directly crossed both STEVE and stable red aurora (SAR) arc. In the ionosphere, STEVE is associated with subauroral ion drift features, including electron temperature peak, density gradient, and westward ion flow. The SAR arc at lower latitudes corresponds to regions inside the plasmapause with isotropic plasma heating, which causes redline‐only SAR emission via heat conduction. STEVE corresponds to the sharp plasmapause boundary containing quasi‐static subauroral ion drift electric field and parallel‐accelerated electrons by kinetic Alfvén waves. These parallel electrons could precipitate and be accelerated via auroral accel. . .
Date: 11/2019 Publisher: Geophysical Research Letters DOI: 10.1029/2019GL082789 Available at: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL082789
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Authors: Wang Zihan, Zou Shasha, Shepherd Simon G., Liang Jun, Gjerloev Jesper W., et al.
Title: Multi‐instrument Observations of Mesoscale Enhancement of Subauroral Polarization Stream Associated With an Injection
Abstract: Subauroral polarization streams (SAPS) prefer geomagnetically disturbed conditions and strongly correlate with geomagnetic indexes. However, the temporal evolution of SAPS and its relationship with dynamic and structured ring current and particle injection are still not well understood. In this study, we performed detailed analysis of temporal evolution of SAPS during a moderate storm on 18 May 2013 using conjugate observations of SAPS from the Van Allen Probes (VAP) and the Super Dual Auroral Radar Network (SuperDARN). The large‐scale SAPS (LS‐SAPS) formed during the main phase of this storm and decayed due to the northward turning of the interplanetary magnetic field. A mesoscale (approximately several hundreds of kilometers zonally) enhancement of SAPS was observed by SuperDARN at 0. . .
Date: 03/2019 Publisher: Journal of Geophysical Research: Space Physics Pages: 1770 - 1784 DOI: 10.1029/2019JA026535 Available at: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JA026535
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Authors: Yang Bing, Donovan Eric, Liang Jun, Ruohoniemi Michael, McWilliams Kathryn, et al.
Title: Storm-time convection dynamics viewed from optical auroras
Abstract: A series of statistical and event studies have demonstrated that the motion of patches in regions of Patchy Pulsating Aurora (PPA) is very close to, if not exactly, convection. Therefore, 2D maps of PPA motion provide us the opportunity to remotely sense magnetospheric convection with relatively high space and time resolution, subject to uncertainties associated with the mapping between the ionosphere and magnetosphere. In this study, we use THEMIS ASI (All Sky Imager) aurora observations combined with RBSP electric field and magnetic field measurements to explore convection dynamics during storm time. From 0500 UT to 0600 UT on March 19 2015, auroral observations across ~4 h of magnetic local time (MLT) show that increases in the westward velocities of patches are closely related to ear. . .
Date: 10/2019 Publisher: Journal of Atmospheric and Solar-Terrestrial Physics Pages: 105088 DOI: 10.1016/j.jastp.2019.105088 Available at: https://www.sciencedirect.com/science/article/pii/S1364682619301129
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