Statistical Study of Selective Oxygen Increase in High-Energy Ring Current Ions During Magnetic Storms

K. Mitani; K. Seki; K. Keika; M. Gkioulidou; L. J. Lanzerotti; D. G. Mitchell; C. A. Kletzing; A. Yoshikawa; Y. Obana

doi:10.1029/2018JA026168

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Statistical Study of Selective Oxygen Increase in High-Energy Ring Current Ions During Magnetic Storms

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Statistical Study of Selective Oxygen Increase in High-Energy Ring Current Ions During Magnetic Storms

K. Mitani, K. Seki, K. Keika, M. Gkioulidou, L. J. Lanzerotti, D. G. Mitchell, C. A. Kletzing, A. Yoshikawa and Y. Obana

Journal of geophysical research. Space physics, Vol.124(5), pp.3193-3209

05/01/2019

DOI: 10.1029/2018JA026168

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Abstract

Ion transport from the plasma sheet to the ring current is the main cause of the development of the ring current. Energetic (>150 keV) ring current ions are known to be transported diffusively in several days. A recent study suggested that energetic oxygen ions are transported closer to the Earth than protons due to the diffusive transport caused by a combination of the drift and drift-bounce resonances with Pc 3-5 ultralow frequency waves during the 24 April 2013 magnetic storm. To understand the occurrence conditions of such selective oxygen increase (SOI), we investigate the phase space densities (PSDs) between protons and oxygen ions with the first adiabatic invariants (mu) of 0.1-2.0 keV/nT measured by the Radiation Belt Storm Probes Ion Composition Experiment instrument on the Van Allen Probes at L similar to 3-6 during 90 magnetic storms in 2013-2017. We identified the SOI events in which oxygen PSDs increase while proton PSDs do not increase during a period of similar to 9 hr (one orbital period). Among the 90 magnetic storms, 33% were accompanied by the SOI events. Global enhancements of Pc 4 and Pc 5 waves observed by ground magnetometers during the SOI events suggest that radial transport due to combination of the drift-bounce resonance with Pc 4 oscillations and the drift resonance with Pc 5 oscillations can be the cause of SOIs. The contribution of the SOI events to the magnetic storm intensity is roughly estimated to be similar to 9% on average.

Astronomy & Astrophysics

Physical Sciences

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Details

Title: Subtitle: Statistical Study of Selective Oxygen Increase in High-Energy Ring Current Ions During Magnetic Storms
Creators: K. Mitani - Nagoya University
K. Seki - The University of Tokyo
K. Keika - The University of Tokyo
M. Gkioulidou - Johns Hopkins University Applied Physics Laboratory
L. J. Lanzerotti - New Jersey Institute of Technology
D. G. Mitchell - Johns Hopkins University Applied Physics Laboratory
C. A. Kletzing - University of Iowa
A. Yoshikawa - Kyushu University
Y. Obana - Osaka Electro-Communication University
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.124(5), pp.3193-3209
Publisher: Amer Geophysical Union
DOI: 10.1029/2018JA026168
ISSN: 2169-9380
eISSN: 2169-9402
Number of pages: 17
Grant note: NAS5-01072; 921647 / JHU/APL under NASA 937836; NAS5-01072 / JHU/APL NAS5-02099 / NASA; National Aeronautics & Space Administration (NASA) AGS-1004814; ATM-0245139 / NSF; National Science Foundation (NSF) 16H06286; 16H02229 / Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science ISEE/Nagoya University Nagoya University Program for Leading Graduate Schools of "Leadership Development Program for Space Exploration and Research" from JSPS Canadian Space Agency
Language: English
Date published: 05/01/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984428807802771

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