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Statistics of Magnetosonic Waves in the Slot Region Observed by Van Allen Probes


AuthorYan, Ling; Cao, Xing; Hua, Man; Ni, Binbin; Zhang, Yuannong;
Keywordsmagnetosonic waves; Slot region; Statistical distribution; Van Allen Probes
AbstractAbstract We perform a statistical analysis of magnetosonic waves in the slot region based on Van Allen Probes observations from September 2012 to February 2018. Our results demonstrate that the wave occurrence rate increases with enhanced geomagnetic activity and decreasing magnetic latitude, with the presence of strongest slot region magnetosonic waves near the geomagnetic equator within the 08-20 MLT sector. Power spectral densities of slot region magnetosonic waves also intensify during geomagnetically active times, with the occurrence of the major wave power (＞∼10-5nT2/Hz) below ∼25fcp (where fcp is the proton gyrofrequency) and the peak wave intensity (∼10-3nT2/Hz) below ∼5fcp at L＞∼2.6. A remarkable gap in the magnetosonic wave frequency spectrum is also revealed at < ∼15fcp during weak substorm activities (AE 300nT).
Year of Publication2021
JournalGeophysical Research Letters
Volumen/a
Number of Pagese2021GL094015
Section
Date Published06/2021
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021GL094015
DOIhttps://doi.org/10.1029/2021GL094015