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Dear Colleagues,</div>
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The XXXVIth URSI General Assembly and Scientific Symposium (URSI GASS 2026: Paper submission
<b>deadline: February 09, 2026</b>) will be held in Krakow, Poland, from August 15 to 22, 2026. </div>
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We invite you to submit <b>contributions</b> to <b>Session FG – Innovations in Space Surveillance and Environmental Interaction</b>.</div>
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Session Description</div>
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This session will explore cutting-edge developments and persistent challenges in <b>
space surveillance and tracking</b> (SST), with a focus on both ground-based and space-borne sensor technologies. We invite contributions that address key aspects of space domain awareness, including but not limited to:</div>
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• Detection, monitoring, and cataloging of resident space objects (RSOs)</div>
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• Initial orbit determination and tracking strategies</div>
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• Characterization and analysis of fragmentation events</div>
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• Ambiguity resolution in radar and optical observations</div>
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• Advanced data processing and sensor fusion techniques</div>
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• Theoretical and computational approaches to orbital dynamics</div>
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In addition, this session welcomes studies on the <b>interactions between space debris and the ionosphere</b>, an area of increasing importance. The ionosphere influences the orbits and lifetimes of objects in space, while plasma irregularities and ionospheric
disturbances can degrade propagating radio waves, reducing the accuracy of tracking data and complicating space situational awareness. Conversely, debris re-entries introduce metal particulates and aerosols into the ionosphere. These pollutants, particularly
in the middle and upper atmosphere, can persist for decades, leaving a long-term environmental legacy. Studies that address these bidirectional couplings between debris populations and ionospheric dynamics are especially encouraged.</div>
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URSI also offers a rich program for students and young scientists, including awards and competitions.</div>
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<div role="presentation">Student Paper Competition</div>
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<div role="presentation">Young Scientist Award</div>
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Kind regards,</div>
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Liliana Macotela (NORCE, Norway)</div>
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Austin Egert (Orion, USA)</div>
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Sari Lasanen (University of Oulu, Finland)</div>
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Tom Grydeland (NORCE, Norway)</div>
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