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dc.contributor.authorLi, Jinxing
dc.contributor.authorBortnik, Jacob
dc.contributor.authorLi, Wen
dc.contributor.authorThorne, Richard M.
dc.contributor.authorMa, Qianli
dc.contributor.authorChu, Xiangning
dc.contributor.authorChen, Lunjin
dc.contributor.authorKletzing, Craig A.
dc.contributor.authorKurth, William S.
dc.contributor.authorHospodarsky, George B.
dc.contributor.authorWygant, John
dc.contributor.authorBreneman, Aaron
dc.contributor.authorThaller, Scott
dc.date.accessioned2019-05-03T20:04:50Z
dc.date.available2019-05-03T20:04:50Z
dc.date.created2017-02-05
dc.identifier.issn2169-9380
dc.identifier.urihttps://hdl.handle.net/10735.1/6448
dc.description.abstractUtilizing simultaneous twin Van Allen Probes observations of whistler mode waves at variable separations, we are able to distinguish the temporal variations from spatial variations, determine the coherence spatial scale, and suggest the possible mechanism of wave modulation. The two probes observed coherently modulated whistler mode waves simultaneously at an unexpectedly large distance up to ~4.3 R_E over 3 h during a relatively quiet period. The modulation of 150-500 Hz plasmaspheric hiss was correlated with whistler mode waves measured outside the plasmasphere across 3 h in magnetic local time and 3 L shells, revealing that the modulation was temporal in nature. We suggest that the coherent modulation of whistler mode waves was associated with the coherent ULF waves measured over a large scale, which modulate the plasmaspheric density and result in the modulation of hiss waves via local amplification. In a later period, the 500-1500 Hz periodic rising-tone whistler mode waves were strongly correlated when the two probes traversed large spatial regions and even across the plasmapause. These periodic rising-tone emissions recurred with roughly the same period as the ULF wave, but there was no one-to-one correspondence, and a cross-correlation analysis suggests that they possibly originated from large L shells although the actual cause needs further investigation.
dc.description.sponsorshipNASA. Grant Numbers: NNX13AI61G, NNX14AN85G, NNX11AR64G, NNX17AD15G, NNX15AI96G. EMFISIS. Grant Number: 1001057397:01. ECT. Grant Numbers: 13‐041, 967399, 921647. NSF Geospace Environment Modeling. Grant Number: AGS‐1723342
dc.language.isoen
dc.publisherAmer Geophysical Union
dc.relation.urihttp://dx.doi.org/10.1002/2016JA023706
dc.rights©2017 American Geophysical Union
dc.subjectRadiation belts
dc.subjectElectrons
dc.subjectMagnetosphere
dc.subjectWhistlers (Radio meteorology)
dc.titleCoherently Modulated Whistler Mode Waves Simultaneously Observed over Unexpectedly Large Spatial Scales
dc.type.genrearticle
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.description.departmentWilliam B. Hanson Center for Space Sciences
dc.identifier.bibliographicCitationLi, Jinxing, Jacob Bortnik, Wen Li, Richard M. Thorne, et al. 2017. "Coherently modulated whistler mode waves simultaneously observed over unexpectedly large spatial scales." Journal of Geophysical Research-Space Physics 122(2): 1871-1882, doi:10.1002/2016JA023706
dc.source.journalJournal of Geophysical Research-Space Physics
dc.identifier.volume122
dc.contributor.utdAuthorChen, Lunjin


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