English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We use SuperDARN data to study high-latitude ionospheric convection over a\udthree hour period (starting at 22:00 UT on 2 January 2003), during which the\udInterplanetary Magnetic Field (IMF) flipped between two states, one with\udBy>>|Bz| and one with Bz>0, both with negative Bx. We\udfind, as expected from previous works, that day side ionospheric convection\udis controlled by the IMF in both hemispheres. For strongly northward IMF, we\udobserved signatures of two reverse cells, both in the Northern Hemisphere\ud(NH) and in the Southern Hemisphere (SH), due to lobe reconnection. On one\udoccasion, we also observed in the NH two viscous cells at the sides of the\udreverse cell pair. For duskward IMF, we observed in the NH a large dusk\udclockwise cell, accompanied by a smaller dawn cell, and the signature of a\udcorresponding pattern in the SH. On two occasions, a three cell pattern,\udcomposed of a large clockwise cell and two viscous cells, was observed in the\udNH. As regards the timings of the NH and SH convection reconfigurations, we\udfind that the convection reconfiguration from a positive Bz dominated to a\udpositive By dominated pattern occurred almost simultaneously (i.e. within\uda few minutes) in the two hemispheres. On the contrary, the reconfiguration\udfrom a By dominated to a northward IMF pattern started in the NH 8–13 min\udearlier than in the SH. We suggest that part of such a delay can be due\udto the following mechanism: as IMF Bx<0, the northward-tailward\udmagnetosheath magnetic field reconnects with the magnetospheric field first\udtailward of the northern cusp and later on tailward of the southern cusp, due\udto the IMF draping around the magnetopause

Different responses of northern and southern high latitude ionospheric convection to IMF rotations: a case study based on SuperDARN observations