Articles | Volume 37, issue 3
https://doi.org/10.5194/angeo-37-381-2019
https://doi.org/10.5194/angeo-37-381-2019
Regular paper
 | 
05 Jun 2019
Regular paper |  | 05 Jun 2019

A new scenario applying traffic flow analogy to poleward expansion of auroras

Osuke Saka

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Latest update: 26 Feb 2024
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Short summary
Flow channel extending in north–south directions is produced in the initial pulse of Pi2 pulsations associated with the field line dipolarization. Drifts in the ionosphere of the order of kilometers per second accumulated plasmas at the low-latitude end of the flow channel. The plasma compression in the ionosphere produced field-aligned currents, parallel electric fields, and auroral expansion. We called the compressive ionosphere a "dynamic ionosphere".