<div dir="ltr"><div dir="ltr"><pre style="margin:0in 0in 0.0001pt;background-image:none;background-position:0% 0%;background-size:auto;background-repeat:repeat;background-origin:padding-box;background-clip:border-box"><font face="georgia, serif" color="#000000">Dear Colleagues,<font size="2"><br></font></font></pre><font face="georgia, serif" color="#000000"><br>We would like to invite you to submit abstracts to the 2025 AGU Fall Meeting session (SA008) - <i>Composition, Wind, and Temperature Variability in the Mesosphere and Ionosphere/Thermosphere</i>. The AGU25 meeting will take place from December 15 to 19 in New Orleans, LA, USA, in a hybrid format. <br><br> ****<b>Session Details</b>****<br>Session Title: SA008 - Composition, Wind, and Temperature Variability in the Mesosphere and Ionosphere/Thermosphere<br>Section: SPA-Aeronomy<br>Session Link: <a href="https://agu.confex.com/agu/agu25/prelim.cgi/Session/249523" target="_blank">https://agu.confex.com/agu/agu25/prelim.cgi/Session/249523</a><br>Primary Convener: Sovit Khadka, Orion Space Solutions<br>Conveners: Jonathan Makela, University of Illinois Urbana-Champaign<br> Liying Qian, National Center for Atmospheric Research<br> Gunter Stober, University of Bern, Switzerland<br> Lilias Claire Gasque, University of California, Berkeley<br><br><b>Session Description:</b><br>The composition, winds, and temperatures of Earth’s mesosphere and ionosphere/thermosphere are determined by the complex interplay of chemical, dynamical, and thermodynamic processes driven by forcing from both above and below. The forcing of these regions and the many different processes involved vary over a wide range of spatial and temporal scales, hindering accurate determination of these fundamental parameters critical to satellite operations and radio communications. Past and current space missions, field campaigns, as well as theoretical and modeling advances, have led to a new understanding of how and why the dominant drivers of upper atmospheric composition, winds, and temperatures in these regions change over different spatial and temporal scales. This session, therefore, seeks to highlight various topics surrounding middle and upper atmospheric composition, wind, and temperature measurements, their variability, and the prominent mechanisms that drive their spatial, seasonal, and inter-annual variability from theoretical, observational, and modeling perspectives.<br><br>We look forward to your contribution to our AGU25 session.<br>Please note that the abstract submission deadline is <b>Wednesday, 30 July 2025 at 23:59 EDT/03:59 UTC</b>.<br><br>Thank you.<br><br>Sincerely,<br><b>The Conveners Team:</b> Sovit Khadka, Jonathan Makela, Liying Qian, Gunter Stober, Lilias Claire Gasque</font></div>
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