University of Oulu

Takeshita, Y., Shiokawa, K., Miyoshi, Y., Ozaki, M., Kasahara, Y., Oyama, S.-i., et al. (2021). Study of spatiotemporal development of global distribution of magnetospheric ELF/VLF waves using ground‐based and satellite observations, and RAM‐SCB simulations, for the March and November 2017 storms. Journal of Geophysical Research: Space Physics, 126, e2020JA028216. https://doi.org/10.1029/2020JA028216

Study of spatiotemporal development of global distribution of magnetospheric ELF/VLF waves using ground‐based and satellite observations, and RAM‐SCB simulations, for the March and November 2017 storms

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Author: Takeshita, Yuhei1; Shiokawa, Kazuo1; Miyoshi, Yoshizumi1;
Organizations: 1Institute for Space-Earth Environmental Research, Nagoya University, Japan
2Kanazawa University, Japan
3University of Oulu, Finland
4National Institute of Polar Research, Japan
5Athabasca University, Canada
6Sodankylä Geophysical Observatory, Finland
7Los Alamos National Laboratory, Los Alamos, NM, USA
8Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy of Siberian Branch of the Russian Academy of Sciences, Yakut Scientific Centre of Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia
9Institute of Solar-Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences, Russia
Format: article
Version: published version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe202103046547
Language: English
Published: American Geophysical Union, 2021
Publish Date: 2021-08-21
Description:

Abstract

Magnetospheric Extremely Low‐Frequency/Very Low‐Frequency (ELF/VLF) waves have an important role in the acceleration and loss of energetic electrons in the magnetosphere through wave‐particle interaction. It is necessary to understand the spatiotemporal development of magnetospheric ELF/VLF waves to quantitatively estimate this effect of wave‐particle interaction, a global process not yet well understood. We investigated spatiotemporal development of magnetospheric ELF/VLF waves using 6 PWING ground‐based stations at subauroral latitudes, Exploration of energization and Radiation in Geospace and RBSP satellites, POES/MetOp satellites, and the RAM‐SCB model, focusing on the March and November 2017 storms driven by corotating interaction regions in the solar wind. Our results show that the ELF/VLF waves are enhanced over a longitudinal extent from midnight to morning and dayside associated with substorm electron injections. In the main to early storm recovery phase, we observe continuous ELF/VLF waves from ∼0 to ∼12 MLT in the dawn sector. This wide extent seems to be caused by frequent occurrence of substorms. The wave region expands eastward in association with the drift of source electrons injected by substorms from the nightside. We also observed dayside ELF/VLF wave enhancement, possibly driven by magnetospheric compression by solar wind, over an MLT extent of at least 5 h. Ground observations tend not to observe ELF/VLF waves in the post‐midnight sector, although other methods clearly show the existence of waves. This is possibly due to Landau damping of the waves, the absence of the plasma density duct structure, and/or enhanced auroral ionization of the ionosphere in the post‐midnight sector.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 126
Issue: 2
Article number: e2020JA028216
DOI: 10.1029/2020JA028216
OADOI: https://oadoi.org/10.1029/2020JA028216
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: MEXT, Japan Society for the Promotion of Science. Grant Numbers: 15H05747,15H05815,17H00728,20H01959, 16H06286; Ministry of Science and Higher Education of the Russian Federation and the Siberian Branch of the Russian Academy of Sciences. Grant Number: AAAA‐A17‐117021450059‐3; Russian Foundation for Basic Research (РФФИ). Grant Number: 18‐45‐140037; National Aeronautics and Space Administration. Grant Number: NAS5‐01072.
Dataset Reference: The PWING observation data are distributed by the Inter‐University Upper atmosphere Global Observation Network (IUGONET) project of the Ministry of Education, Culture, Sports, Science and Technology of Japan. Science data of the ERG (Arase) satellite were obtained from the ERG Science Center. In the present analysis, the authors use Arase satellite data of PWE/OFA Level2 v02.01 (Kasahara et#x000A0;al., 2018b), ORB L2 v02 (Miyoshi et al., 2018b), and ORB_L3 (TS04) V02 (Miyoshi et#x000A0;al., 2018c). The ORB Level 3 v02 contains minor errors of L* (less than 0.05 for both events) compared with ORB Level 3 v01. The authors used the Van Allen Probes data of RBSP‐A (‐B)_WFR‐SPECTRAL‐MATRIX_EMFISIS‐L2 and RBSP‐A (‐B)‐RBSPICE_LEV‐3_ESRHELT. All the data of Van Allen Probes, NOAA/METOP POES satellites and solar wind parameters used in this paper are taken from and publicly available at NASA CDAWeb (http://cdaweb.gsfc.nasa.gov/istp_public/http://cdaweb.gsfc.nasa.gov/istp_public/). The RAM‐SCB model is available from https://github.com/lanl/RAM-SCB.
  http://cdaweb.gsfc.nasa.gov/istp_public/
http://cdaweb.gsfc.nasa.gov/istp_public/
https://github.com/lanl/RAM-SCB
Copyright information: © 2020. American Geophysical Union. All Rights Reserved.