
<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div style="margin-top: 0.5em; margin-bottom: 0.5em;">Dear Colleagues,</div><div style="margin-top: 0.5em; margin-bottom: 0.5em;">We invite you to contribute by submitting an abstract to the <span style="font-weight: bold;">EGU26 (EGU General Assembly) session ST4.2</span>, titled "Nowcasting, forecasting, operational monitoring, and post-event analysis of space weather and space climate in the Sun-Earth system" and scheduled for <span style="font-weight: bold;">3–8 May 2026, Vienna</span>, Austria & Online.</div><div style="margin-top: 0.5em; margin-bottom: 0.5em;">The <span style="font-weight: bold;">abstract submission deadline</span> is Thursday, <span style="font-weight: bold;">15 January</span> 2026, <span style="font-weight: bold;">13:00 CET</span>. </div><ul style="margin-block-start: 1em;"><li style="text-align: left; list-style-type: disc; margin-top: 0.5em; margin-bottom: 0.5em;">Abstract submission Link: <span style="display: inline-block;"><a href="https://www.egu26.eu/session/57158">https://www.egu26.eu/session/57158</a></span>.</li></ul><div style="margin-top: 0.5em; margin-bottom: 0.5em;"><span style="font-weight: bold;">ST4.2 session summary:</span><br>Space weather and space climate describe the dynamic interactions between the Sun and Earth across timescales from minutes to decades, affecting regions from the heliosphere to the lower atmosphere. Extreme events such as coronal mass ejections, interplanetary shocks, and solar energetic particle events can significantly impact satellites, communication and navigation systems, power grids, aviation, and other critical infrastructure. This session highlights the current state of space weather products and invites contributions on forecasting and nowcasting tools, observations and data assimilation, numerical and machine-learning models, and space weather indices. Interdisciplinary studies and work linking research with operational applications, particularly those addressing real-world impacts and mitigation strategies, are especially welcome.</div><div style="margin-top: 0.5em; margin-bottom: 0.5em;"><span style="font-weight: bold;">Confirmed invited speakers:</span></div><div style="margin-top: 0.5em; margin-bottom: 0.5em;"><ul class="MailOutline"><li><b>Matthew West</b> (ESA/ESTEC) will present "<i>The ESA Vigil Mission at L5: Operational and Scientific Space Weather Opportunities from a New Perspective</i>”.</li><li><b>Suzy Bingham</b> (Met Office) will present "<i>Nowcasting, forecasting and operational monitoring of space weather at the UK Met Office</i>”.</li></ul></div><div style="margin-top: 0.5em; margin-bottom: 0.5em;">We look forward to your valuable contributions and appreciate your attention and interest.</div><div style="margin-top: 0.5em; margin-bottom: 0.5em;">Sincerely yours, session conveners,<br>Maike Bauer,<br>Guram Kervalishvili,<br>Yulia Bogdanova, <br>Claudia Borries, <br>Therese Moretto Jorgensen</div><div><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div style="color: rgb(14, 16, 26); background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box; margin-top: 0pt; margin-bottom: 0pt;"><span data-preserver-spaces="true" style="background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box; margin-top: 0pt; margin-bottom: 0pt;"><br class="Apple-interchange-newline">--</span></div><div style="color: rgb(14, 16, 26); background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box; margin-top: 0pt; margin-bottom: 0pt;"><strong style="background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box; margin-top: 0pt; margin-bottom: 0pt;">Dr. Guram Kervalishvili</strong></div><div style="color: rgb(14, 16, 26); background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box; margin-top: 0pt; margin-bottom: 0pt;"><span data-preserver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