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<b>**Please note the abstract deadline for AOGS 2024 has been
extended to 10th January**</b>
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<p>Dear Colleagues,<br>
</p>
<p>We warmly invite abstracts to our session at Asia Oceania
Geosciences Society meeting (<a
href="https://www.asiaoceania.org/aogs2024/public.asp?page=home.asp"
target="_blank" class="moz-txt-link-freetext"
moz-do-not-send="true">https://www.asiaoceania.org/aogs2024/public.asp?page=home.asp</a>)
in Pyeongchang, Gangwon-do (23rd-28th June 2024). Our session
ST20 is entitled "<i>Observations and Modelling of Geomagnetic
Sudden Commencements: the Effects of Solar Wind Pressure
Pulses</i>". Abstracts are due for submission on 10th
January 2024. <br>
</p>
<p>Please see session abstract below:</p>
<p><i>Pockets of solar wind plasma that are faster and/or denser
than the surrounding ambient plasma are known as solar wind
pressure pulses. When these pressure pulses impact the
terrestrial magnetopause, they rapidly compress the
magnetosphere and excite the electrodynamics within. As the
effects propagate inwards a well observed enhancement in the
horizontal ground magnetic field occurs; this communication
of pressure pulse effects into the magnetosphere is known as
a geomagnetic sudden commencement (SC). SCs can be further
subdivided into sudden impulses (SIs) and sudden storm
commencements (SSCs), where in the latter case, the pressure
pulse is followed by a geomagnetic storm. Even for small
enhancements in solar wind dynamic pressure, the internal
magnetospheric effects can be dramatic. Among these effects,
observations and modelling suggest: enhancements and
restructuring of high latitude ionospheric currents and
convection; auroral emission excited by particle
precipitation; energisation of the plasmasphere; excitation
of magnetospheric current systems; enhanced ULF wave
activity; space weather effects such as
geomagnetically-induced currents (GICs).<br>
<br>
In this session we warmly invite contributions based on
either observations or modelling of the effects of
geomagnetic sudden commencements on the coupled solar wind –
magnetosphere – ionosphere system. Papers may present
results on phenomena including (but not limited to): ULF
wave propagation; ionospheric convection; ionospheric and
magnetospheric current systems; auroral emission;
terrestrial radio emissions; plasmasphere effects; GIC
effects. We seek to facilitate cross-over discussion between
the observational and modelling communities, and provide
fertile ground for future collaborative work in the
community.</i><br>
</p>
<p>We look forward to seeing you in Gangwon-do!</p>
<p>Session conveners: </p>
Dr Alexandra Fogg (Dublin Institute for Advanced Studies)<br>
Dr Igino Coco (Istituto Nazionale di Geofisica e Vulcanologia,
Rome, Italy)<br>
Dr Andy Smith (Department of Mathematics, Physics and Electrical
Engineering, Northumbria University, Newcastle upon Tyne, UK)
<pre class="moz-signature" cols="72">--
Dr. Alexandra Ruth Fogg (she/her)
IRC Government of Ireland Postdoctoral Fellow
School of Cosmic Physics - Astronomy & Astrophysics
Dublin Institute for Advanced Studies
<a class="moz-txt-link-freetext"
href="https://orcid.org/0000-0002-1139-5920"
moz-do-not-send="true">https://orcid.org/0000-0002-1139-5920</a></pre>
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