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Return-Path: <atel@astronomerstelegram.org> Delivered-To: stefano@bicar.it Received: by mail.planetcloud-host.com (Postfix, from userid 1016) id 5DCCF1455E; Sun, 16 Nov 2025 08:06:07 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.planetcloud-host.com X-Spam-Level: X-Spam-Status: No, score=-0.0 required=6.0 tests=RCVD_IN_DNSWL_BLOCKED, RCVD_IN_VALIDITY_RPBL_BLOCKED,RCVD_IN_VALIDITY_SAFE_BLOCKED,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=174.142.199.243; helo=server.astronomerstelegram.org; envelope-from=atel@astronomerstelegram.org; receiver=stefano@bicar.it Received: from server.astronomerstelegram.org (astronomerstelegram.org [174.142.199.243]) by mail.planetcloud-host.com (Postfix) with ESMTP id 8D421144A4 for <stefano@bicar.it>; Sun, 16 Nov 2025 08:06:04 +0100 (CET) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 9696A28807A3 for <stefano@bicar.it>; Sun, 16 Nov 2025 02:06:03 -0500 (EST) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17494 Message-Id: <20251116070603.9696A28807A3@server.astronomerstelegram.org> Date: Sun, 16 Nov 2025 02:06:03 -0500 (EST) ------------------------------------------------------------------------------ The Astronomer's Telegram is free to read, free to publish, free to use. Thanks to the support of our patrons, we can continue to keep it free. https://www.patreon.com/astronomerstel ------------------------------------------------------------------------------ The Astronomer's Telegram http://www.astronomerstelegram.org ------------------------------------------------------------------------------ Posted: Within the last 24 hours ============================================================================== ATEL #17494 ATEL #17494 Title: X-flaring active region at the solar western limb: possible SEPs event Author: Costantino Sigismondi (ICRANet, Pescara and UPRA, Roma) Queries: sigismondi@icra.it Posted: 15 Nov 2025; 19:53 UT Subjects:Optical, Ultra-Violet, X-ray, Gamma Ray, >GeV, The Sun The propensity of the Active Region AR 14274 to produce Long Duration Events has been clear since its appearance at the solar Eastern limb. The events M5 of 3rd November 2025 and, more evidently, X1.2 of 10 November, with the acceleration of solar energetic particles (SEPs) have been registered by the Space Weather satellites, and the Observatories all around the World. The increasing intensity of the major flares followed a regular time pattern, with a periodicity near 24 hours, with largest flares occurring after a "charging time" nearly exact multiple of this characteristic time. The sequence of the major flares has been up to now X1.8 (4 Nov), M7.5-M8.6 (5 Nov), X1.7 (9 Nov), X1.2 (10 Nov), X5.1 (11 Nov) and X4.0 (14 Nov). The largest X-class flares produced aurorae on 12 November 2025 even at Mediterranean regions (see ATel #16635) and significant proton fluxes, the first SEPs events of 2025, after two events on 8 June 2024 and 21 November 2024, both geo-effective, with the emitting regions near the Western limb. These Space Weater events are harmful for astronauts and satellite payloads. Due to the energetics and the regularity of this flaring Active Region AR14274, it is reliable to expect another X-class event with SEPs at the Western limb, geo-effective, around X5 class, especially if released as late as 17 November 2025. There is chance also of seeing the flare in white light, during the peak phase, as it may have occurred to observers like Christopher Scheiner (1573-1650) and Athanasius Kircher (1602-1680) well before the 1859-Carrington event (cfr. Histories, 5, 48, 2025 https://www.mdpi.com/2409-9252/5/4/48). Flares and aurorae from AR 4274 at ICRANet-Pescara, Italy: https://icranet.org/index.php?option=com_content&task=view&id=1596 ------------------------------------------------------------------------------ Password Certification: Costantino Sigismondi (sigismondi@icra.it) https://www.astronomerstelegram.org/?read=17494 ============================================================================== ============================================================================== This is an automatically-generated notice. You can remove yourself permanently from receiving both the Daily Email Digest and Instant Email Notices from The Astronomer's Telegram by following this link: https://www.astronomerstelegram.org?unsubscribe&confirmation=a803d34e7ea924f9a4142bac00763549&address=stefano@bicar.it
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