The Link between Wedge-like and Nose-like Ion Spectral Structures in the Inner Magnetosphere

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Abstract
AbstractThe wedge-like and nose-like ion spectral structures, named after their characteristic shapes in the energy-time spectrograms, appear to be distinctively different structures in the Earth s inner magnetosphere. Here we present a case study with conjugate observations from the Arase spacecraft and the twin Van Allen Probes on July 1 and 2, 2017, which displayed the characteristic signatures of the wedge-like and nose-like ion structures, respectively. When the spacecraft nearly intersected at L =2.8, the two structures overlapped with enhanced ion fluxes in the energy range of 1-10 keV. These observations suggest that the wedge-like and nose-like spectral signatures are merely the manifestations of one single structure along different spacecraft trajectories. This finding is further validated by the reproduction of both structures from a particle-tracing model, which also indicates their formation processes associated with the intermittent substorm injections in the nightside magnetosphere.
Notes
Year of Publication
2021
Journal
Geophysical Research Letters
Volume
n/a
Number
Number of Pages
e2021GL093930
Date Published
06/2021
URL
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021GL093930
DOI
https://doi.org/10.1029/2021GL093930