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<span style="font-family: ""Aptos"", Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Dear Colleagues,</span>
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You are cordially invited to submit abstracts to the 2026 AGU Fall Meeting session (SA016) - Moving Beyond F10.7: Reassessing Solar EUV Irradiance Observations, Models, and Upper Atmospheric Impacts. The AGU26 meeting will take place from December 07 to 11
in San Francisco, California, USA.</div>
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****Session Details****</div>
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Session Title: SA016 - Moving Beyond F10.7: Reassessing Solar EUV Irradiance Observations, Models, and Upper Atmospheric Impacts</div>
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Section: SPA-Aeronomy</div>
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Session Link: https://agu.confex.com/agu/agu26/prelim.cgi/Session/282848</div>
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Session Description:</div>
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Solar Extreme Ultraviolet (EUV) irradiance is the primary energy input driving the dynamics, chemistry, and structure of the ionosphere-thermosphere (IT) system. For decades, the 10.7-cm solar radio flux (F10.7) has served as the baseline proxy for this energy.
However, investigations over the past 20 years have exposed critical limitations, demonstrating that non-linearities in the F10.7 index make it an imperfect and sometimes misleading irradiance proxy. Concurrently, there is a growing realization that historical
empirical irradiance models, such as HEUVAC, are based on early calibrations that are fundamentally inconsistent with modern, high-precision spectroradiometric measurements from TIMED SEE and SDO EVE. We welcome abstracts focusing on: Cross-calibrating and
reconciling historical EUV models with modern observations from TIMED and SDO; and the sensitivity and response of upper atmospheric and ionospheric measurements and models to these revised historical and modern EUV irradiance inputs at Earth and other planets.</div>
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We look forward to your contribution to our AGU26 session.</div>
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Please note that the abstract submission deadline is Wednesday, 05 August 2026 at 23:59 EDT/03:59+1 GMT.</div>
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Thank you.</div>
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Sincerely,</div>
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Ed Thiemann (CU/LASP) on behalf of co-conveners...</div>
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Phil Chamberlin (CU/LASP)</div>
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Samuel Schonfeld (AFRL)</div>
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