Storm time occurrence and spatial distribution of Pc4 poloidal ULF waves in the inner magnetosphere: A Van Allen Probes statistical study

Craig Kletzing; Lei Dai; Kazue Takahashi; Lunjin Chen; Robert Lysak; Chi Wang; John R Wygant; John Bonnell; Cynthia A Cattell; Charles W Smith; Robert J MacDowall; Scott Thaller; Aaron Breneman; Xiangwei Tang; Xin Tao

doi:10.1002/2015JA021134

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Storm time occurrence and spatial distribution of Pc4 poloidal ULF waves in the inner magnetosphere: A Van Allen Probes statistical study

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Storm time occurrence and spatial distribution of Pc4 poloidal ULF waves in the inner magnetosphere: A Van Allen Probes statistical study

Craig Kletzing, Lei Dai, Kazue Takahashi, Lunjin Chen, Robert Lysak, Chi Wang, John R Wygant, John Bonnell, Cynthia A Cattell, Charles W Smith, …

Journal of geophysical research. Space physics, Vol.120(6), pp.4748-4762

06/2015

DOI: 10.1002/2015JA021134

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Abstract

Poloidal ULF waves are capable of efficiently interacting with energetic particles in the ring current and the radiation belt. Using Van Allen Probes (Radiation Belt Storm Probes (RBSP)) data from October 2012 to July 2014, we investigate the spatial distribution and storm time occurrence of Pc4 (7–25 mHz) poloidal waves in the inner magnetosphere. Pc4 poloidal waves are sorted into two categories: waves with and without significant magnetic compressional components. Two types of poloidal waves have comparable occurrence rates, both of which are much higher during geomagnetic storms. The noncompressional poloidal waves mostly occur in the late recovery phase associated with an increase of Dst toward 0, suggesting that the decay of the ring current provides their free energy source. The occurrence of dayside compressional Pc4 poloidal waves is found correlated with the variation of the solar wind dynamic pressure, indicating their origin in the solar wind. Both compressional and noncompressional waves preferentially occur on the dayside near noon at L∼5–6. In addition, compressional poloidal waves are observed at magnetic local time 18–24 on the nightside. The location of the Pc4 poloidal waves relative to the plasmapause is investigated. The RBSP statistical results may shed light on the in-depth investigations of the generation and propagation of Pc4 poloidal waves.

geomagnetic storm

Pc4 ULF waves

poloidal waves

ring current

solar wind dynamic pressure

Van Allen Probe

Details

Title: Subtitle: Storm time occurrence and spatial distribution of Pc4 poloidal ULF waves in the inner magnetosphere: A Van Allen Probes statistical study
Creators: Craig Kletzing - University of California, Berkeley
Lei Dai - Chinese Academy of Sciences
Kazue Takahashi - Johns Hopkins University Applied Physics Laboratory
Lunjin Chen - University of Texas at Dallas
Robert Lysak - University of Minnesota
Chi Wang - Chinese Academy of Sciences
John R Wygant - University of Minnesota
John Bonnell - University of Iowa
Cynthia A Cattell - University of Minnesota
Charles W Smith - University of New Hampshire
Robert J MacDowall - Goddard Space Flight Center
Scott Thaller - University of Minnesota
Aaron Breneman - University of Minnesota
Xiangwei Tang - University of Minnesota
Xin Tao - University of Science and Technology of China
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.120(6), pp.4748-4762
DOI: 10.1002/2015JA021134
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Blackwell Publishing Ltd
Number of pages: 15
Grant note: DOI: 10.13039/100000104, name: NASA, award: NNX14AB97G; DOI: 10.13039/501100001809, name: NNSFC, award: 41231067; name: Specialized Research Fund for State Key Laboratories of China; name: JHU/APL
Language: English
Date published: 06/2015
Academic Unit: Physics and Astronomy
Record Identifier: 9984199791102771

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