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BEGIN:VEVENT
DTSTAMP:20260428T040159Z
DTSTART;VALUE=DATE-TIME:20200113T150000
DTEND;VALUE=DATE-TIME:20200113T160000
SUMMARY:Jasmine Sandhu (MSSL/UCL): The Terrestrial Ring Current: Investig
 ating the role of substorms in ring current variability
TZID:Europe/London
UID:20200113-8a17841b6e5a6816016e5f68dce51c8e@warwick.ac.uk
CREATED:20200108T142955Z
DESCRIPTION:The terrestrial ring current is observed to experience dramat
 ic and intense variations with significant implications for wider geomag
 netic processes. Key impacts include wave-particle interactions and the 
 transport and loss of radiation belt electrons. For example\, ring curre
 nt intensifications weaken the geomagnetic field\, which allows signific
 ant ULF wave power to access the inner magnetosphere and drive rapid rad
 iation belt electron transport via enhanced ULF radial diffusion. Furthe
 rmore\, EMIC waves generated by ion anisotropies from substorm injection
 s couple to ultra-relativistic MeV electrons and drives rapid radiation 
 belt electron loss through particle precipitation. In this seminar\, I w
 ill discuss how substorms contribute to and shape the ring current prope
 rties. Using ion observations from the Van Allen Probes\, I conduct stat
 istical analyses of the ring current energy content and anisotropies. I 
 will show that substorms are associated with a significant enhancement o
 f the ring current energy content (~12% for a typical substorm). For inc
 reased solar wind driving the substorm-associated enhancement increases\
 , and multiple substorms occurring in direct succession is more likely. 
 For these cases\, substorm dynamics can play a crucial role in substanti
 ally energising the ring current. I also investigate storm time variatio
 ns using a superposed epoch analysis and conduct a comparison to ring cu
 rrent indices. The results show that ring current indices significantly 
 underestimate the energy content of the ring current. I also demonstrate
  that there is a significant timing discrepancy\, such that the ring cur
 rent intensity peaks ~12 hours later than predicted by ring current indi
 ces. This discrepancy is attributed to substorm activity. Finally\, I pr
 esent some preliminary results exploring how ring current anisotropy var
 ies during substorms. The analysis shows that the ring current ions expe
 rience significant isotropisation following substorm onset. This change 
 can be ascribed to either the properties of the injected and convected p
 opulation and/or EMIC wave activity. I present a consideration of both f
 actors.
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20200108T142955Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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