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EP: Fachverband Extraterrestrische Physik
EP 9: Sun and Heliosphere III
EP 9.4: Vortrag
Donnerstag, 19. März 2026, 14:30–14:45, KH 01.019
First look at the solar cosmic ray event on 11 November 2025 as measured by neutron monitors — •Christian Steigies1, Lukas Bäni2, and Rolf Bütikofer2 — 1Christian-Albrechts-Universität zu Kiel, Germany — 2Universität Bern, Switzerland
On 11 November 2025, the global network of neutron monitors measured an increase in the count rate caused by solar cosmic rays. This event was number 77 of solar cosmic rays observed at ground since 1942: GLE77. It was caused by an X5 class flare at 10:10 UTC and is comparable in size to the last major GLE on 6 December 2006 (GLE70). Since some neutron monitor stations at low latitudes, such as Mexico, also observed a significant increase in the count rate during GLE77, the energy spectrum was harder than during GLE70 and during the very large GLE69 on 20 January 2005. Based on the neutron monitor measurements, we estimated the characteristics of solar cosmic rays during the maximum phase of GLE77. This allows to assess the maximum additional radiation exposure at flight altitude caused by solar cosmic rays during GLE77.
Keywords: Cosmic Rays; ground level enhancement