Oral Presentation
Quasiperiodic modulations of energetic electron fluxes in the ULF range observed by the ERG satellite.
Presenter: MARIKO Teramoto (Nagoya University)
Exploration of energization and Radiation in Geospace (ERG) satellite was
successfully launched on December 20, 2016. The Extremely High-Energy
Electron Experiment (XEP) and High-Energy Electron Experiments (HEP-L and
HEP-H) are carried by the ERG satellite to observe energetic electrons.
These instruments frequently observed quasiperiodic modulations of energetic
electron fluxes with period of ~ 100-600 sec. Continuous flux modulations with
the period of ~600 s appeared in the 700keV-3.6MeV energy range during the
period 0920UT-1120UT on March 31, 2017 when the ERG satellite was located
at L~5.5-6.1 and MLT~3-4 h. We compare these flux modulations with the
magnetic field observed by the Magnetic Field Experiment (MGF) on the ERG
satellite. It is found that these flux modulations are not accompanied by
corresponding magnetic signatures. It indicates that these quasiperiodic flux
modulations are not caused by drift-resonant interactions between ULF waves
and energetic electrons, at least locally. In this study, we will show several events
and discuss possible mechanism for quasiperiodic flux modulations of energetic
electrons on XEP and HEP.
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