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

. For the first time, direct comparisons of the equatorial ion partial pressureand pitch angle anisotropy observed by TWINS and simulated by CIMI arepresented. The TWINS ENA images are from a 4-day period, 7–10 September2015. The simulations use both the empirical Weimer 2K and theself-consistent RCM electric potentials. There are two moderate storms insuccession during this period. In most cases, we find that the generalfeatures of the ring current in the inner magnetosphere obtained from theobservations and the simulations are similar. Nevertheless, we do also seeconsistent contrasts between the simulations and observations. The simulatedpartial pressure peaks are often inside the observed peaks and more towarddusk than the measured values. There are also cases in which the measuredequatorial ion partial pressure shows multiple peaks that are not seen in thesimulations. This occurs during a period of intense AE index. The CIMIsimulations consistently show regions of parallel anisotropy spanning thenight side between approximately 6 and 8 RE, whereas theparallel anisotropy is seen in the observations only during the main phase ofthe first storm. The evidence from the unique global view provided by theTWINS observations strongly suggests that there are features in the ringcurrent partial pressure distributions that can be best explained by enhancedelectric shielding and/or spatially localized, short-duration injections.

Dynamics of a geomagnetic storm on 7–10 September 2015 as observed by TWINS and simulated by CIMI