X-flaring region AR 4419 to the solar limb: opportunity for white light signatures
ATel #17763; Costantino Sigismondi (ICRANet Pescara and APRA-ISF Rome)
on 24 Apr 2026; 14:14 UT
Credential Certification: Costantino Sigismondi (sigismondi@icra.it)
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)
