Conjugate Ground-Spacecraft Observations of VLF Chorus Elements

TitleConjugate Ground-Spacecraft Observations of VLF Chorus Elements
Publication TypeJournal Article
Year of Publication2017
AuthorsDemekhov, AG, Manninen, J, ík, O, Titova, EE
JournalGeophysical Research Letters
Pagination11,735 - 11,744
Date Published12/2017
Keywordsground-spacecraft observations; Magnetosphere; Van Allen Probes; VLF chorus
AbstractWe present results of simultaneous observations of VLF chorus elements at the ground-based station Kannuslehto in Northern Finland and on board Van Allen Probe A. Visual inspection and correlation analysis of the data reveal one-to-one correspondence of several (at least 12) chorus elements following each other in a sequence. Poynting flux calculated from electromagnetic fields measured by the Electric and Magnetic Field Instrument Suite and Integrated Science instrument on board Van Allen Probe A shows that the waves propagate at small angles to the geomagnetic field and oppositely to its direction, that is, from northern to southern geographic hemisphere. The spacecraft was located at L≃4.1 at a geomagnetic latitude of −12.4∘ close to the plasmapause and inside a localized density inhomogeneity with about 30% density increase and a transverse size of about 600 km. The time delay between the waves detected on the ground and on the spacecraft is about 1.3 s, with ground-based detection leading spacecraft detection. The measured time delay is consistent with the wave travel time of quasi-parallel whistler-mode waves for a realistic profile of the plasma density distribution along the field line. The results suggest that chorus discrete elements can preserve their spectral shape during a hop from the generation region to the ground followed by reflection from the ionosphere and return to the near-equatorial region.
Short TitleGeophys. Res. Lett.

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