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Dear Colleagues,<br>
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<b>The XXXVIth URSI General Assembly and Scientific Symposium (URSI GASS 2026)</b> will be held in <u><a style="color: rgb(150, 96, 125);" class="OWAAutoLink" id="OWAd56bdf5b-6dd3-3db2-101d-af4a0879c647" href="https://www.ursi-gass2026.pl/">Krakow, Poland,
from August 15 to 22, 2026</a></u>.<br>
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We invite you to submit contributions to <b>Session G14 - Natural and Anthropogenic Sources of Transient Plasmas and Radio Emissions in the Near-Space Environment</b><br>
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<b>Session Description</b>: This session focuses on transient plasma phenomena in the near-Earth environment generated by both natural (e.g., micrometeoroids) and anthropogenic (e.g., re-entering objects) sources. Emphasis is placed on the physical processes
by which high-speed particles entering or impacting the atmosphere, spacecraft, or planetary surfaces produce dense plasmas, how these plasmas expand and evolve, and how they couple into electromagnetic effects such as collisional electromagnetic pulses (EMPs),
electromagnetic ion-cyclotron (EMIC) waves, and other transient wave modes producing distinctive radio and radar signatures.<br>
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The session invites observational, theoretical, and modeling studies spanning atmospheric and<br>
ionospheric meteor events to impact-generated EMPs on spacecraft or planetary surfaces. For<br>
micrometeoroids, particular attention is given to entry and impact processes—sputtering,<br>
fragmentation, ablation, and ionization—and their influence on derived atmospheric and ionospheric parameters including neutral winds, temperatures, densities, meteor orbits, and masses. We especially encourage contributions on radio and radar detection, plasma
diagnostics, and numerical simulations of these highly transient events. Comparative studies of natural versus anthropogenicplasma sources and discussions of their broader implications for space weather, spacecraft charging, space situational awareness, and
atmospheric composition are also welcome.<br>
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URSI also offers a rich program for students and young scientists, including awards and competitions.<br>
<br>
<b>Important Information and Useful Links</b>:</div>
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<u><a style="color: rgb(150, 96, 125);" class="OWAAutoLink" id="OWA7d9a6a31-6dba-5b93-2de5-ffa11ade4da5" href="https://www.eventure-online.com/eventure/login.form?A094859a9-5d82-40b2-8667-d3c6e7d18a9c">Paper submission</a></u> (deadline: January 25, 2026):<br>
<u><a style="color: rgb(150, 96, 125);" class="OWAAutoLink" id="OWA52b90858-8dc3-5078-78ca-875cf4bb3166" href="https://www.ursi-gass2026.pl/studentpaper">Student Paper Competition</a></u> <br>
<u><a style="color: rgb(150, 96, 125);" class="OWAAutoLink" id="OWA32a22aac-04cb-fade-dd05-ce2af1d39c19" href="https://www.ursi-gass2026.pl/youngscientist">Young Scientist Award</a></u> <br>
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Kind regards,</div>
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Jorge Chau, </div>
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Julio Urbina, </div>
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Yanlin Li</div>
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