On Strong Coupling between the Harang Reversal Evolution and Substorm Dynamics: A Synthesis of SuperDARN, DMSP and IMAGE Observations Shasha Zou1, Larry.

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Presentation transcript:

On Strong Coupling between the Harang Reversal Evolution and Substorm Dynamics: A Synthesis of SuperDARN, DMSP and IMAGE Observations Shasha Zou1, Larry Lyons1, Chih-Ping Wang1, Athanasios Boudouridis1, Mike Ruohoniemi2, Phillip Anderson3 University of California, Los Angeles, USA Applied Physics Laboratory, John Hopkins University, USA University of Texas at Dallas, USA

Physics of the Harang Reversal Introduction: Physics of the Harang Reversal Less energetic protons · j|| from LLBL j|| Finite width of tail E Median energy proton drift pass More energetic protons from far tail The Harang reversal results from dawn-dusk pressure asymmetry in the near-earth plasma sheet [Erickson et al., 1991] A part of the Region-2 field-aligned (shielding) current system

Onset FUV Imager/WIC Particle Injection & Positive Bay 18 March 2005 10:26:30 UT Particle Injection & Positive Bay Onset 21 MLT

TIGER Radar Pair Observation 18 March 2005 10:26-10:28 UT 18 MLT Merged vector Line-of-sight vector -80° -70° -60° 21 MLT 24 MLT Substorm onset occurs at the center of the Harang reversal.

· + 18 March 2005 0952-0954 UT 18 MLT DMSP F13/ F16 Equatorward Boundary SAPS 24 MLT

TIGER Radar Pair Observation 18 March 2005 10:26-10:28 UT SAPS Majority of the westward flows equatorward of the Harang reversal are SAPS.

Four More Events 1 Jan. 2005 1236-1238 UT 11 Feb. 2005 1044-1046 UT 6 Nov. 2005 1116-1118 UT 3 Dec. 2005 1238-1240 UT

SAPS electric field response at onset

18 March 2005 Growth Phase Evolution of the Harang Reversal Onset ?

Summary and Conclusions 1. Relationship between substorm onset and HR? HR observed during all nine substorm events we analyzed. Substorm onset occurs at center of Harang flow shear, suggesting that substorm upward FAC comes out of ionosphere from there. 2. Relation of HR to other Region-2 features? Majority of westward flows equatorward of HR are SAPS. Onset observed just poleward of SAPS implies that onset occurs near inner edge of electron plasma sheet. 3. Evolution of HR flows after onset? Depend strongly on their location relative to that of onset. SAPS suddenly increase at onset. The observations demonstrate a strong coupling between HR evolution and substorm dynamics, suggesting that nightside R-2 physics is closely associated with substorm dynamics.