JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM16] [EE] Physics of Inner Magnetosphere Coupling

Tue. May 23, 2017 3:30 PM - 5:00 PM A02 (Tokyo Bay Makuhari Hall)

convener:Danny Summers(Memorial University of Newfoundland), Jichun Zhang(University of New Hampshire Main Campus), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Kunihiro Keika(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo ), Aleksandr Y Ukhorskiy(Johns Hopkins University Applied Physics Laboratory), Dae-Young Lee(Chungbuk Natl Univ), Yiqun Yu(Beihang University), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Chairperson:Aleksandr Ukhorskiy(Johns Hopkins University Applied Physics Laboratory)

4:45 PM - 5:00 PM

[PEM16-18] Spectral structures of energetic electrons in the inner magnetosphere

*Jichun Zhang1, Cristian P. Ferradas1, Emily M. Mello1, Vania K. Jordanova2, Harlan E. Spence1, Brian A. Larsen2, Geoffrey G. Reeves2, Ruth M. Skoug2, Herbert O. Funsten2 (1.University of New Hampshire, 2.Los Alamos National Laboratory)

Keywords:Magnetospheric configuration and dynamics, Plasma convection , Plasma sheet , Ring current, Solar wind/magnetosphere interactions

Electron spectral structures in the energy-time flux spectrograms are the observational signatures of electron acceleration, transport, and loss in the global magnetosphere. Combining in situ measurements with backward particle drift path simulations, we studied electron spectral structures in the inner magnetosphere before and during the 1 June 2013 storm (min. Dst = -119 nT). For the purpose of comparison, proton results were also included. Electron spectral structures were less dynamic during storm time than quiet time, because deeper transport and more enhanced fluxes smeared the spectral structures. Electron injection depth and some spectral features were fairly well reproduced with the Weimer96 electric field and the dipole magnetic field. Although always drifting eastward, electrons could still display multiple spectral structures. Their formation was attributed to “drift resonance”, i.e., electrons with different energies drifting around the Earth by a different number of loops. Pitch angle scattering loss played an important role in the formation of electron spectral features.