SM52A-07
GLOBAL STORM-TIME EVOLUTION OF THE RING CURRENT AND THE MAGNETIC FIELD FROM IMAGE AND TS07D
Friday, 18 December 2015: 11:50
2018 (Moscone West)
Pontus C. Brandt1, Mikhail I. Sitnov1, Syau-Yun Wang Hsieh2, Robert Demajistre1 and Grant K Stephens1, (1)Applied Physics Laboratory Johns Hopkins, Laurel, MD, United States, (2)Johns Hopkins Univ, Laurel, MD, United States
Abstract:
The global storm-evolution of the structure of the inner magnetosphere is believed to be dictated by the dynamic force balance between energetic particles and electrical currents. In this presentation we address how the global evolution of energetic particle spectra and species affect the global field-structure of the inner magnetosphere across storm phases and different storms. We compare the global storm evolution of energetic protons (27-198 keV) and O+ (74-300 keV), obtained from the High-Energy Neutral Atom (HENA) Camera on board IMAGE, to the statistically obtained magnetic field and electrical current distributions from the TS07d model. The energetic particle distributions are obtained from a constrained linear inversion of the HENA images, validated by in-situ measurements from Cluster and optimized through simulations using the HENA response function. We discuss in particular the local-time asymmetry of the main phase ring current and associated energetic particle pressure and its dependence on solar wind parameters, and the evolution to a symmetric recovery-phase ring current.
