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Magnetospheric ULF waves with increasing amplitude related to solar wind dynamic pressure changes: The Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations
dc.contributor.authorShen, X. C.en_US
dc.contributor.authorZong, Q.‐g.en_US
dc.contributor.authorShi, Q. Q.en_US
dc.contributor.authorTian, A. M.en_US
dc.contributor.authorSun, W. J.en_US
dc.contributor.authorWang, Y. F.en_US
dc.contributor.authorZhou, X. Z.en_US
dc.contributor.authorFu, S. Y.en_US
dc.contributor.authorHartinger, M. D.en_US
dc.contributor.authorAngelopoulos, V.en_US
dc.date.accessioned2015-11-12T21:04:34Z
dc.date.available2016-11-01T16:43:14Zen
dc.date.issued2015-09en_US
dc.identifier.citationShen, X. C.; Zong, Q.‐g. ; Shi, Q. Q.; Tian, A. M.; Sun, W. J.; Wang, Y. F.; Zhou, X. Z.; Fu, S. Y.; Hartinger, M. D.; Angelopoulos, V. (2015). "Magnetospheric ULF waves with increasing amplitude related to solar wind dynamic pressure changes: The Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations." Journal of Geophysical Research: Space Physics 120(9): 7179-7190.en_US
dc.identifier.issn2169-9380en_US
dc.identifier.issn2169-9402en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/115986
dc.description.abstractUltralow frequency (ULF) waves play an important role in transferring energy by buffeting the magnetosphere with solar wind pressure impulses. The amplitudes of magnetospheric ULF waves, which are induced by solar wind dynamic pressure enhancements or shocks, are thought to damp in one half a wave cycle or an entire wave cycle. We report in situ observations of solar wind dynamic pressure impulse‐induced magnetospheric ULF waves with increasing amplitudes. We found six ULF wave events induced by solar wind dynamic pressure enhancements with slow but clear wave amplitude increase. During three or four wave cycles, the amplitudes of ion velocities and electric field of these waves increased continuously by 1.3–4.4 times. Two significant events were selected to further study the characteristics of these ULF waves. We found that the wave amplitude growth is mainly contributed by the toroidal mode wave. Three possible mechanisms of causing the wave amplitude increase are discussed. First, solar wind dynamic pressure perturbations, which are observed in a duration of 20–30 min, might transfer energy to the magnetospheric ULF waves continually. Second, the wave amplitude increase in the radial electric field may be caused by superposition of two wave modes, a standing wave excited by the solar wind dynamic impulse and a propagating compressional wave directly induced by solar wind oscillations. When superposed, the two wave modes fit observations as does a calculation that superposes electric fields from two wave sources. Third, the normal of the solar wind discontinuity is at an angle to the Sun‐Earth line. Thus, the discontinuity will affect the dayside magnetopause continuously for a long time.Key PointsSix Psw enhancement‐induced ULF waves with increasing amplitudes were observedThe wave amplitude could increase four times in several wave periodsSuperposition of two wave modes could cause the wave amplitude increaseen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherwave amplitude increaseen_US
dc.subject.othermagnetosphereen_US
dc.subject.othersolar wind dynamic pressureen_US
dc.subject.otherwave modes superpositionen_US
dc.subject.otherULF waveen_US
dc.titleMagnetospheric ULF waves with increasing amplitude related to solar wind dynamic pressure changes: The Time History of Events and Macroscale Interactions during Substorms (THEMIS) observationsen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelAstronomy and Astrophysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/115986/1/jgra52015_am.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/115986/2/jgra52015.pdf
dc.identifier.doi10.1002/2014JA020913en_US
dc.identifier.sourceJournal of Geophysical Research: Space Physicsen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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