<html><head></head><body><div class="ydpd496470fyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false"><div>Dear Colleagues,</div><div><br></div><div>We are pleased to invite abstracts to the session ST-13 titled '<b>Geoeffectiveness of ICMEs from Sun to Earth Including the May and October 2024 Events</b>' in the upcoming AOGS 2026 conference in Fukuoka, Japan, during 02-07 August, 2026. Abstract submission deadline on<b> 23 January, 2026</b>.</div><div><br></div><div>Session Description:</div><div><br></div><div dir="ltr" data-setdir="false">Space climate in the Sun-Earth system can be considered as the expected average behaviour of the solar wind and IMF, geomagnetic field, magnetosphere, ionosphere, thermosphere and geomagnetically induced currents (GIC). Space weather is the unexpected short-term changes in the above phenomena. Space weather originates from the Sun as solar eruptions (solar flares and coronal mass ejections or CMEs) and high-speed streams. CMEs flowing through the interplanetary space become interplanetary CMEs (CMEs) cause large changes in the interplanetary space such as shocks and solar energetic particle (SEP) events. The fast solar wind or high-speed streams originating from coronal holes interact with the slow wind ahead, forming corotating interaction regions (CIRs). The interaction of the ICMEs and CIRs with the Earth’s magnetosphere through magnetic reconnection leads to wave-particle interactions, radio bursts, intense radiation belts, large currents in the magnetosphere and ionosphere, geomagnetic storms/activities, intense auroras, ionosphere-thermosphere storms, large geomagnetically induced currents (GICs), etc. Sometimes space weather becomes severe resulting in extensive societal and economic disruptions by damaging satellite systems, electric power grids, railway traffic systems, radio communication-navigation systems, oil and gas metal pipelines. For example, if a space weather event similar to the 1859 Carrington event occurs at the present time, it results in economic losses up to (estimated) 1-2 trillion US Dollars. Quebec 1989 geomagnetic storm caused a cost of ~13.2 million including system damage and power revenue loss. This session invites contributions on all aspects of space weather studies using ground- and space-based observations, theory and modelling including 10-12 May and 9-10 October 2024 events that caused geomagnetic storms of historical proportions. </div><div><br></div><div>Conveners: V. Manu, N. Gopalswamy, Y. Ebihara, Zhang Qinghe, M. Klimenko</div><div><br></div><div dir="ltr" data-setdir="false"><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">Please feel free to contact me at <b>manuvarghese@nssc.ac.cn</b> in case of any inquiries.</span></span><br></div><div><br></div><div>Best regards,</div><div>Manu Varghese, Ph.D.</div><div>National Space Science Center,</div><div>Beijing, China.</div><div><br><br></div></div></div></body></html>