# Méndez 2024: Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal > Abel Méndez, Kevin Ortiz Ceballos, Jorge I. Zuluaga, 2024. 12 records on Mysteries Department cite it. The leading natural hypothesis; the authors state… Source: https://mysteriesdept.com/sources/SRC0CXZ4D2Y44ST/arecibo-wow-i-an-astrophysical-explanation-for-the-wow Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) --- [Sources](https://mysteriesdept.com/sources)[Wow! signal](https://mysteriesdept.com/mysteries/wow-signal)Méndez 2024 **0** # Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal Abel Méndez, Kevin Ortiz Ceballos, Jorge I. Zuluaga, 2024. _arXiv_. Reports Arecibo drift scans at 1420 MHz from February to May 2020 that found narrowband signals from small cold hydrogen clouds, about a hundred times weaker than the Wow! signal, and proposes that the Wow! signal was a maser-like or superradiant brightening of such a cloud triggered by a magnetar flare or soft gamma repeater. **Wow! signal** PreprintCopy of **[Arecibo 1420 MHz drift scans, February–May 2020](https://mysteriesdept.com/mysteries/wow-signal/artifacts/ART0CXZ52T8551D/arecibo-1420-mhz-drift-scans-februarymay-2020)** Checked against the original0 ## What it's used for here The leading natural hypothesis; the authors state that the trigger was not observed and that the hypothesis does not exclude other origins. ## Cited by on this site 12 records [A sudden maser-like or superradiant brightening of a small cold interstellar hydrogen cloud, triggered by a…](https://mysteriesdept.com/mysteries/wow-signal/answers/ANS0CXZ4SHC7DZM/a-sudden-maser-like-or-superradiant-brightening-of-a-small) Answer ANS [Arecibo 1420 MHz drift scans, February–May 2020](https://mysteriesdept.com/mysteries/wow-signal/artifacts/ART0CXZ52T8551D/arecibo-1420-mhz-drift-scans-februarymay-2020) ART [Arecibo 1420 MHz drift scans, February–May 2020: document](https://mysteriesdept.com/mysteries/wow-signal/copies/CPY0CXZ532233NZ/arecibo-1420-mhz-drift-scans-februarymay-2020-document) CPY [Arecibo 1420 MHz drift scans, February–May 2020 (Arecibo REDS, project A3123)](https://mysteriesdept.com/datasets/DAT0CXZ50C40KBH/arecibo-1420-mhz-drift-scans-februarymay-2020-arecibo-reds) Dataset DAT [A maser flare would need hydrogen densities about a thousand times those of diffuse clouds; the authors…](https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4TGM3QAK/a-maser-flare-would-need-hydrogen-densities-about-a-thousand) Evidence EVD [Arecibo drift scans found narrowband hydrogen-line signals from small cold clouds, about a hundred times…](https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4SS641MV/arecibo-drift-scans-found-narrowband-hydrogen-line-signals) Evidence EVD [No triggering transient was observed in 1977 and no second example of such a flare has been recorded.](https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4T8T7FRW/no-triggering-transient-was-observed-in-1977-and-no-second) Evidence EVD [Arecibo drift scans near the hydrogen line find faint narrowband signals from small cold hydrogen clouds](https://mysteriesdept.com/mysteries/wow-signal/events/EVT0CXZ4NCJ6P59/arecibo-drift-scans-near-the-hydrogen-line-find-faint) EVT [Méndez, Ortiz Ceballos and Zuluaga propose a hydrogen-cloud flare](https://mysteriesdept.com/mysteries/wow-signal/events/EVT0CXZ4NMC4NS6/mendez-ortiz-ceballos-and-zuluaga-propose-a-hydrogen-cloud) EVT [Abel Méndez](https://mysteriesdept.com/mysteries/wow-signal/people/FIG0CXZ4J707PQ3/abel-mendez) FIG [The Wow! signal](https://mysteriesdept.com/mysteries/wow-signal) The mystery article MYS [What produced the Wow! signal?](https://mysteriesdept.com/mysteries/wow-signal/questions/QST0CXZ4P403VSY/what-produced-the-wow-signal) Question QST ## Cite it ``` Méndez, A., Ortiz Ceballos, K., & Zuluaga, J. I. (2024). Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal. arXiv. https://arxiv.org/abs/2408.08513 ``` [Read it free at arxiv.org](https://arxiv.org/abs/2408.08513) Key **SRC** 0CXZ4D2Y44ST Kind Preprint Rights arXiv-nonexclusive Kept 27 Oct 2026, for editors Checked Against the published original Added by [apollo](https://mysteriesdept.com/u/apollo) The record Bibliographic records are CC0. Take this one as CSL-JSON, BibTeX or RIS. [CSL-JSON](https://mysteriesdept.com/sources/SRC0CXZ4D2Y44ST/arecibo-wow-i-an-astrophysical-explanation-for-the-wow/csl.json)