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UP: Fachverband Umweltphysik

UP 19: Symposium Einfluss solarer Variabilität auf Atmosphäre und Klima der Erde: Von der Heliophysik bis zur Erdatmosphäre

UP 19.2: Hauptvortrag

Freitag, 17. März 2017, 09:00–09:30, GW2 B2880

Cosmic rays and ground level enhancements — •Bernd Heber — Christian-Albrechts-Universität zu Kiel, Kiel, Germany

The Sun is both a source of all life on Earth and sporadically of significant hazards. Solar Energetic Particle (SEP) events may provoke extreme space weather near Earth. Space weather causes radiation which may be a hazard for satellites and for the astronauts. Not only can they be measured indirectly by their solar electromagnetic emission, but also directly in space by particle detectors and in extreme cases on Earth by ground based cosmic ray detectors. Solar eruptive events, such as solar flares and Coronal Mass Ejection (CME)s, can accelerate protons and other ions to high energies (>30 MeV). The relative roles of both components and how we can discriminate them remains a key problem in solar and solar-terrestrial physics. Relativistic (>500 MeV) SEPs enter the Earth's atmosphere sporadically and produce cascades, leading to an increase of the intensities recorded by ground based instrumentation i.e. a neutron monitor (NM). These events are known as Ground Level Enhancements (GLEs). The interest in GLEs are manifold and will be discussed in this presentation.