Global, Energy-Dependent Ring Current Response During Two Large Storms

Wednesday, 16 December 2015: 12:05
2018 (Moscone West)
Jerry Goldstein1, Vassilis Angelopoulos2, James L Burch1, Sebastian De Pascuale3, Stephen A Fuselier4, Kevin James Genestreti4, William S Kurth3, Kristie LLera5, David J McComas4, Geoffrey D Reeves6, Harlan E. Spence7 and Philip W Valek8, (1)Southwest Research Institute San Antonio, San Antonio, TX, United States, (2)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (3)University of Iowa, Iowa City, IA, United States, (4)Southwest Research Institute, San Antonio, TX, United States, (5)University of Texas at San Antonio, Department of Physics & Astronomy, San Antonio, TX, United States, (6)Los Alamos National Laboratory, Los Alamos, NM, United States, (7)University of New Hampshire Main Campus, Space Science Center, Durham, NH, United States, (8)Southwest Research Inst, San Antonio, TX, United States
Two recent large (~200 nT) geomagnetic storms occurred during 17--18 March 2015 and 22--23 June 2015. The global, energy-dependent ring current response to these two extreme events is investigated using both global imaging and multi-point in situ observations. Energetic neutral atom (ENA) imaging by the Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) mission provides a global view of ring current ions. Local measurements are provided by two multi-spacecraft missions. The two Van Allen Probes measure in situ plasma (including ion composition) and fields at ring current and plasmaspheric L values. The recently launched Magnetospheric Multiscale (MMS) comprises four spacecraft that have just begun to measure particles (including ion composition) and fields at outer magnetospheric L-values. We analyze the timing and energetics of the stormtime evolution of ring current ions, both trapped and precipitating, using TWINS ENA images and in situ data by the Van Allen Probes and MMS.