BEGIN:VCALENDAR VERSION:2.0 PRODID:-//AIP Calendar//www.aip.de// BEGIN:VEVENT SUMMARY:Colloquium | Juan Sebastián Castellanos-Durán (MPS\, Germany) DTSTART:20260903T123000Z DTEND:20260903T133000Z DTSTAMP:20260826T133051Z UID:www.aip.de-2563 CATEGORIES:Scientific CATEGORIES:Scientific Talk CATEGORIES:Public CATEGORIES:Colloquium CONTACT:Julián Alvarado-Gómez DESCRIPTION:Speaker: Juan Sebastián Castellanos-Durán (MPS\, Germany) (M ax Planck Institute for Solar System Research (MPS\, Göttingen\, Germany) )\nTitle: On the extremes of solar spectropolarimetric data: Superstrong m agnetic fields and extreme limb observations\nAbstract: This talk focuses on the extremes of solar spectropolarimetric data and is divided into two parts that highlight recent observational advances.\nThe first part addres ses superstrong magnetic fields in bipolar light bridges (BLBs). While pre vious observations noted rare cases of BLBs with extremely strong magnetic fields near 8.2 kG\, it was unclear if this was the exception or the rule . By applying a state-of-the-art inversion technique to an extensive set o f Hinode/SOT-SP data\, we show that fields exceeding 4.0 kG\, at the heigh t of maximum magnetic sensitivity\, with even higher field strengths in de eper layers. Our analysis shows that these superstrong fields are very com mon on the Sun and indicates that BLBs form a distinct physical population with a unique combination of continuum intensity and field strength\, sep arate from standard umbrae and penumbrae.\nIn the second part\, we move to the extreme solar limb to discuss low-straylight spectroscopy from the Su nrise III/SUSI stratospheric observatory. We analysed a scan reaching up t o 6.5 Mm off-limb in the 407.6 to 410.25 nm wavelength range. We detected 174 spectral lines in emission\, more than double what has been previously reported. Surprisingly\, most of these lines begin showing emission while still on the disc\, and a notable fraction come from rare-earth and heavy elements that normally show very weak absorption on-disc.\nNote: Host: Me etu Verma\n LOCATION:AIP\; Kirch building\, Conference room END:VEVENT END:VCALENDAR