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Longitudinal dependence of whistler mode electromagnetic waves in the Earth\textquoterights inner magnetosphere


Authorahlava, J.; emec, F.; ik, O.; a, I.; Hospodarskyy, G.; Parrot, M.; Kurth, W.; Bortnik, J.; Kletzing, C.;
KeywordsDEMETER; Van Allen Probes; Whistler waves
AbstractWe use the measurements performed by the DEMETER (2004-2010) and the Van Allen Probes (2012-2016, still operating) spacecraft to investigate the longitudinal dependence of the intensity of whistler mode waves in the Earth\textquoterights inner magnetosphere. We show that a significant longitudinal dependence is observed inside the plasmasphere on the nightside, primarily in the frequency range 400 Hz\textendash2 kHz. On the other hand, almost no longitudinal dependence is observed on the dayside. The obtained results are compared to the lightning occurrence rate provided by the OTD/LIS mission normalized by a factor accounting for the ionospheric attenuation. The agreement between the two dependencies indicates that lightning generated electromagnetic waves may be responsible for the observed effect, thus substantially affecting the overall wave intensity in the given frequency range. Finally, we show that the longitudinal dependence is most pronounced for waves with oblique wave normal angles.
Year of Publication2018
JournalJournal of Geophysical Research: Space Physics
Volume
Number of Pages
Section
Date Published07/2018
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018JA025284
DOI10.1029/2018JA025284