Abstract
[1] The lower-latitude boundary of the proton aurora, i.e., the isotropic boundary (IB), marks the transition from a full downgoing loss cone on the poleward side to an empty downgoing loss cone on the equatorward side. A number of authors have correlated this boundary with the amount of stretching in the magnetic field using GOES spacecraft. In this paper, we use 264 substorm events from the IMAGE SI-12 global proton auroral imager to show that during substorms, the proton aurora splits longitudinally 48% of the time. We hypothesize that the splitting is a result of the azimuthal growth of the substorm current wedge and show that splitting is more likely during stronger substorms (lower AL).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.