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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17763
Message-Id: <20260425070315.BF70428807D8@server.astronomerstelegram.org>
Date: Sat, 25 Apr 2026 03:03:15 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17763							     ATEL #17763

Title:	X-flaring region AR 4419 to the solar limb: opportunity for
		white light signatures
Author:	Costantino Sigismondi (ICRANet Pescara and APRA-ISF Rome)
Queries:	sigismondi@icra.it
Posted:	24 Apr 2026; 14:14 UT
Subjects:Optical, X-ray, Request for Observations, The Sun, Transient

The active region AR 14419 is a medium size beta-gamma-delta region, at
the end of its presence on the solar hemisphere visible from Earth. Its
evolution from C-class towards M-class and X-flaring occurred rapidly from
23 April, topping on 24 April with two X2.5 flares, separated by 7 hours.
There is also a notewhorty sympatheticity with the AR 14421.

An evident periodical pattern of X-rays flux helps to predict new strong
flares after 15 UT of 24 April 2026.

The location near the limb of such active region makes interesting also
a white light imaging, due to the contrast for hotter and higher regions,
responsible of the faculae.

Analogous white-light observations may have originate the "Schema Corporis
Solaris" published by Athanasius Kircher (1602-1680) in the Mundus Subterraneus,
Amsterdam (1665); Athanasius Kircher and Christoph Scheiner (1573-1650)
on that drawing made in 1635, could have exended to the whole solar surface
what was occasionally visible near the limbs, correctly identifying the
"Royal Zone" between +/-40 degrees of heliolatitude.

Accompanying material (images and references): https://drive.google.com/file/d/18VLcRwi7NRZ06us2qTbDpZOS1JR5yIIG/view?usp=sharing
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