Berlin 2014 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 8: Sonne und Heliosphäre (II)
EP 8.5: Talk
Friday, March 21, 2014, 11:45–12:00, DO24 1.103
Influence of Ground Level Enhancements on the Terrestrial Production of 10Be, 14C and 36Cl — •Konstantin Herbst1, Jürg Beer2, Bernd Heber1, Allan J. Tylka3, and William F. Dietrich4 — 1IEAP, Christian-Albrechts-Universität zu Kiel, Kiel, Germany — 2Swiss Federal Institute of Aquatic Science and Technology, EAWAG, Switzerland — 3Space Science Division, Naval Research Laboratory, Washington, DC, USA — 4Praxis, Inc., Alexandria, VA, USA
Cosmogenic radionuclides are a product of the interaction of primary cosmic rays, in particular galactic cosmic rays (GCRs), with the Earth’s atmosphere. But only primary particles with energies above several 100 MeV can trigger the necessary reaction chains. Because GCRs are modulated by the solar activity on their way through the interplanetary medium the GCR-induced cosmogenic radionuclide production is anti-correlated to the solar cycle. During phases of strong solar activity also solar energetic particle (SEP) events occur frequently. In particular SEP events which can be detected by ground-based instruments, so-called ground level enhancements (GLEs), may strongly contribute to the cosmogenic radionuclide production. Beside the variation due to the modulation of GCRs we will investigate the influence of 58 GLEs, which occurred within the past five solar cycles and discuss the possibility to detect such events in present ice-core and tree-ring records. In addition, an estimate for the probability to find such events over the past 10’000 years, also known as Holocene, during different modulation conditions will be given.