Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Faculty Publications Article Faculty Publications -Articles Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Creator An entity primarily responsible for making the resource Devaraj, A.; Narendranath, S.; Kartha, Sreeja S.; Sarantos, M.; Akhil, Krishna R.; Mathew, Blesson; Sivarani, T.; Nidhi, S.; Anbazhagan, P.; Selvakumar, G. Title A name given to the resource Non-linear solar EUV-driven sodium release from the lunar surface: a contrast to the linear PSD model Date A point or period of time associated with an event in the lifecycle of the resource 01-01-2025 Source A related resource from which the described resource is derived Monthly Notices of the Royal Astronomical Society;Volume;543;Issue;2;pp.1079-1091 Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.1093/mnras/staf1447" target="_blank" rel="noreferrer noopener">https://doi.org/10.1093/mnras/staf1447</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105017432127?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105017432127?origin=resultslist</a> Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Devaraj A., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560029, India, Aryabhatta Research Institute of Observational Sciences, Devasthal Observatory, Uttarakhand, Nainital, 263001, India; Narendranath S., Space Astronomy Group, U R Rao Satellite Centre, ISRO, Bengaluru, 560037, India; Kartha S.S., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Sarantos M., Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, 20771, MD, United States; Akhil K.R., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Mathew B., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Sivarani T., Indian Institute of Astrophysics, Bengaluru, 560034, India; Nidhi S., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560029, India, The Oxford College of Science, 17th, 32, 19th Main road, Sector 4, HSR Layout, Karnataka, Bengaluru, 560102, India; Anbazhagan P., Indian Institute of Astrophysics, Bengaluru, 560034, India; Selvakumar G., Indian Institute of Astrophysics, Bengaluru, 560034, India Description An account of the resource The correlation between solar Extreme Ultra-Violet (EUV) radiation above 8.8eV and the release of sodium from the lunar surface via photon-stimulated desorption (PSD) is investigated. We use simultaneous measurements of EUV photon flux and Na optical spectral line flux (FNa) from the lunar exosphere. Data were acquired with the high-resolution (R?72000) Echelle Spectrograph on the 2.34-m Vainu Bappu Telescope during the lunar first quarter (2024 JanuaryMarch), observing NaI D2 and D1 flux at altitudes below ?590km from the surface. Simultaneous EUV and FUV measurements were acquired from the GOES-R Series Extreme Ultraviolet Sensor (EUVS), while NUV data were obtained from the Total and Spectral Solar Irradiance Sensor-1 (TSIS-1) aboard the ISS. We correlated FNa with EUV photon flux from EUVS across six bands spanning 2561405 (48.58.8eV) and NUV (20004000 from TSIS-1. A non-linear rise in lunar exospheric sodium with increasing EUV and FUV fluxes was observed, contrasting with previous linear PSD models. The EUV radiation above 10eV drives sodium release, with 256-304wavelengths as dominant contributors. Additionally, the NUV flux and FNa are positively correlated, indicating the role of sodium release. The zenith column density averages 3.3 109 atoms cm-2, with Characteristic temperatures averaging at ?6700K and scale heights of ?1500km. Elevated temperatures and sodium densities during solar activity suggest enhanced Na release during flares. These results emphasize the need for a revised PSD model above 8.8 eV and improved constraints on the PSD cross-section. The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society. Subject The topic of the resource Moon; Planets and satellites: atmospheres; planets and satellites: surfaces; Sun: UV radiation; Techniques: spectroscopic Telescopes Publisher An entity responsible for making the resource available Oxford University Press Relation A related resource ISSN: 358711; CODEN: MNRAA Language A language of the resource English Type The nature or genre of the resource Article Rights Information about rights held in and over the resource All Open Access; Gold Open Access; Green Open Access Format The file format, physical medium, or dimensions of the resource online