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Statistical Study of Chorus Modulations by Background Magnetic Field and Plasma Density


AuthorXia, Zhiyang; Chen, Lunjin; Li, Wen;
KeywordsVan Allen Probes
AbstractIn this study, we use observations of THEMIS and Van Allen Probes to statistically study the modulations of chorus emissions by variations of background magnetic field and plasma density in the ultra low frequency range. The modulation events are identified automatically and divided into three types according to whether the chorus intensity correlates to the variations of the magnetic field only (Type B), plasma density only (Type N), or both (Type NB). For the THEMIS observations, the occurrences of the Types B and N are larger than Type NB, while for the Van Allen Probes observations, most events are of Type N. The chorus intensity is mostly correlated to the magnetic field strength negatively and plasma density positively. The chorus intensity tends to increase when the magnitude of the magnetic field perturbation increases, but little dependence on plasma density perturbation amplitude is found.
Year of Publication2020
JournalGeophysical Research Letters
Volume47
Number of Pagese2020GL089344
Section
Date Published11/2020
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GL089344
DOIhttps://doi.org/10.1029/2020GL089344