================================================ 2nd Announcement & Call for Papers, March 31, 2026 We are pleased to announce: OPAC-IROWG 2026 International Workshop on Occultations for Probing Atmosphere and Climate Joint OPAC-8 & IROWG-11 Workshop September 10-16, 2026, Seggau Castle, Leibnitz near Graz, Austria https://opacirowg2026.uni-graz.at/en/ **************************************************************************** An attractive forum for everybody interested in atmospheric remote sensing by occultation methods and/or the use of occultation data in atmospheric physics, meteorology, and climate. **************************************************************************** Please forward also to colleagues who might be interested. You are cordially invited to join OPAC-IROWG 2026 - Welcome! Please submit your abstract before May 3, 2026 via https://opacirowg2026.uni-graz.at/en/abstract-submission/ An earlier submission is, however, encouraged to ease your travel arrangements. We have reserved a block of rooms in Seggau Castle (promotion code: OPAC2026). This block reservation is secured until May 31. U. Foelsche, J. Danzer, M. Schwärz, (WEGC & IPhys UniGraz, AT), OPAC Chairs H. Shao (JCSDA and UCAR, USA), IROWG Co-Chair A.J. Mannucci (JPL, Pasadena, USA), IROWG-CGMS Rapporteur ==================================================