Dayside Cusp Aurorae and Ionospheric Convection Under Radial Interplanetary Magnetic Fields

Hsien Ming Li, Jih Hong Shue, Satoshi Taguchi, Masahito Nosé, Keisuke Hosokawa, J. Michael Ruohoniemi, Yongliang Zhang, Simon Wing, Mark Lester

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3 Scopus citations


Dayside cusp aurorae are created from particles precipitating into the cusp, and ionospheric convection is driven by solar wind electric fields. In this study, we coordinated the observations obtained from the all-sky camera on Svalbard, the Super Dual Auroral Radar Network, SuperMAG magnetometer data, and far ultraviolet imagers on board the Defense Meteorological Satellite Program satellites for the event January 4, 2014 to examine the morphology of aurorae and the patterns of ionospheric convection for radial interplanetary magnetic field (IMF). During the event, a poleward-moving auroral form and antisunward ionospheric convection were observed when the IMF turned into almost purely radial. Moreover, both types of antisunward and sunward convection were simultaneously observed near the footprint of the cusp at different times during the radial IMF period. The antisunward convection and sunward convection are typically an indicator of the dayside reconnection for the southward IMF and the lobe reconnection for the northward IMF, respectively. All those observations support the concept of low-latitude dayside and high-latitude lobe reconnection for the radial IMF. This study further shows that the coexistence of the two types of reconnection for radial IMF, resulting in an interplay of repetitive antisunward and sunward convection.

Original languageEnglish
Article numbere2019JA027664
JournalJournal of Geophysical Research: Space Physics
Issue number5
StatePublished - May 2021


  • Dayside cusp aurora
  • S-shaped aurora
  • ionospheric convection
  • magnetosheath plasma jets
  • poleward-moving auroral form
  • radial interplanetary magnetic field


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