Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

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

[P-EM13] Inner magnetosphere: Recent understanding and new insights

Tue. May 28, 2019 3:30 PM - 5:00 PM A04 (TOKYO BAY MAKUHARI HALL)

convener:Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Danny Summers(Memorial University of Newfoundland), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Shinji Saito(Graduate School of Science, Nagoya University), Chairperson:Yoshizumi Miyoshi(ISEE, Nagoya University), Danny Summers

4:40 PM - 4:55 PM

[PEM13-10] Conjugated quasi-periodic ELF/VLF emissions between the Arase satellite and both Van Allen Probes

*Claudia Martinez Calderon1,2, Frantisek Nemec3, Kazuo Shiokawa2, Yuto Katoh1, Yoshiya Kasahara4, Shoya Matsuda2, Fuminori Tsuchiya1, Atsushi Kumamoto1, Mariko Teramoto2, Ayako Matsuoka5, Yoshizumi Miyoshi2, Ondrej Santolik6,3, George Hospodarksy7 (1.Dept. Geophys., Grad. Sch. Sci., Tohoku University, 2.Instute for Space-Earth Environmental Research, Nagoya University, 3.Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic, 4.Kanazawa University, 5.Japan Aerospace Exploration Agency, 6.Institute of Atmospheric Physics, Prague, Czech Republic, 7.Department of Physics and Astronomy, University of Iowa, USA)

Keywords:conjugated event, VLF, QP, Arase, RBSP, plasma waves

Extremely Low (ELF) and Very Low Frequency (VLF) emissions are naturally occurring magnetospheric plasma waves in the frequencies of 3 Hz to 30 kHz. They play a fundamental role in radiation belt dynamics, accelerating or scattering electrons through wave-particle interactions. We report the first quasi-periodic (QP) emission simultaneously observed by the Arase (ERG) satellite and both Van Allen Probes (RBSP). This is one of few known conjugated satellite events where the waves show very similar spectral and temporal features. The event was observed on November 29, 2018 from approximately 11 to 13:30 UT by both RBSP, while ERG observed it from 12 to 14 UT. Using wave analysis, propagation parameters, and intensities simultaneously measured at several locations we will discuss the approximate location of the source region. We will also discuss the eventual timing differences between QP periodicity at different locations. Some slight variation in the spectral shapes is observed. We will discuss possible relationships with the variations of plasma number density, magnetic field, and energetic electron distribution.