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 Reshma, M.; Stalin, C.S.; Kumar Mandal, Amit; Gudennavar, S.B.; Benedict, Senorita; Joseph, Prajwel Title A name given to the resource Ultraviolet variability in radio-loud active galactic nuclei observed by UVIT onboard AstroSat Date A point or period of time associated with an event in the lifecycle of the resource 01-01-2026 Source A related resource from which the described resource is derived Journal of High Energy Astrophysics;Volume;53;Issue;;Article No.;100601; Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.1016/j.jheap.2026.100601" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.jheap.2026.100601</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105034549515?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105034549515?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 Reshma M., Department of Physics and Electronics, CHRIST University, Karnataka, Bengaluru, 560029, India; Stalin C.S., Indian Institute of Astrophysics, Block II, Koramangala, Karnataka, Bengaluru, 560034, India; Kumar Mandal A., Center for Theoretical Physics of the Polish Academy of Sciences, Al. Lotnikow 32/46, Warsaw, 02-668, Poland; Gudennavar S.B., Department of Physics and Electronics, CHRIST University, Karnataka, Bengaluru, 560029, India; Benedict S., St. Josephs University, 36, Lal Bagh Main Road, Langford Gardens, Bengaluru, 560 027, India; Joseph P., Indian Institute of Astrophysics, Block II, Koramangala, Karnataka, Bengaluru, 560034, India Description An account of the resource Radio-loud active galactic nuclei (AGN) are among the most luminous objects in the Universe, emitting radiation from low-energy radio waves to high energy ? -rays. They are well known to exhibit flux variations at nearly all accessible wavelengths. However, their variability properties in the ultraviolet (UV) band remain relatively less explored compared to other wavebands. Here, we present the results of a systematic investigation of the UV flux and spectral variability characteristics of 24 radio-loud AGN spanning the redshift range 0.018 ? z ? 2.218. The sample comprises 17 BL Lac objects, 6 flat spectrum radio quasars (FSRQs) and one radio-loud narrow line Seyfert 1 galaxy. We used observations obtained with the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat during its first ten years of operation, covering both the far-UV (FUV; 1300 - 1800 and near-UV (NUV; 2000 - 3000 bands. Of the 24 sources analysed, 18 showed significant UV variability on hour timescales. We found a bluer when brighter (BWB) spectral trend in two sources: the FSRQ CTA 102 and the BL Lac PKS 0447 - 439. The observed UV variability in our sample of radio-loud AGN, together with the BWB trend detected in these two sources, supports a scenario in which the hour timescale UV variations are driven by intrinsic processes within their relativistic jets. 2026 Elsevier B.V. Subject The topic of the resource Active galactic nuclei; BL lacertae objects; Blazars; Flat spectrum radio quasars; Narrow-line Seyfert 1 galaxy; Ultraviolet variability Publisher An entity responsible for making the resource available Elsevier B.V. Relation A related resource ISSN: 22144048; 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 Restricted Access; Hardcopy may be available in the library Format The file format, physical medium, or dimensions of the resource online