Chapter 10 Inversion Methodology of Ground Level Enhancements

While it is believed that the acceleration of Solar Energetic Particles (SEPs) is powered by the release of magnetic energy at the Sun, the nature, and location of the acceleration are uncertain, i.e. the origin of the highest energy particles is heavily debated. Information about the highest energy SEPs relies on observations by ground-based Neutron Monitors (NMs). SEPs with energies above 500 MeV entering the Earth’s atmosphere will lead to an increase of the intensities recorded by NMs on the ground, also known as Ground Level Event or Ground Level Enhancement (GLE). A Fokker-Planck equation well describes the interplanetary transport of near relativistic electrons and protons. An NM is an integral counter defined by its yield function. From the observations of the NM network, the additional solar cosmic ray characteristics (intensity, spectrum, and anisotropy) in the energy range &500 MeV can be assessed. If the interplanetary magnetic field outside the Earth magnetosphere is known (see Sect. 10.3.2) a computation chain can be set up in order to calculate the count rate increase of an NM for a delta injection at the Sun along the magnetic field line that connects the Sun with the Earth (Sect. 10.3.3). By this computations, we define a set of B. Heber ( ) • D. Galsdorf • K. Herbst • P. Kühl • J. Labrenz Christian-Albrechts-Universität zu Kiel, Kiel, Germany e-mail: heber@physik.uni-kiel.de; galsdorf@physik.uni-kiel.de; herbst@physik.uni-kiel.de; kuehl@physik.uni-kiel.de; labrenz@physik.uni-kiel.de N. Agueda University of Barcelona, Barcelona, Spain e-mail: agueda@fqa.ub.edu R. Bütikofer University of Bern, Physikalisches Institut, Sidlerstrasse 5, CH-3012 Bern, Switzerland High Altitude Research Stations Jungfraujoch and Gornergrat, Sidlerstrasse 5, CH-3012 Bern, Switzerland e-mail: rolf.buetikofer@space.unibe.ch R. Vainio Department of Physics and Astronomy, University of Turku, Turku, Finland e-mail: rami.vainio@utu.fi © The Author(s) 2018 O.E. Malandraki, N.B. Crosby (eds.), Solar Particle Radiation Storms Forecasting and Analysis, The HESPERIA HORIZON 2020 Project and Beyond, Astrophysics and Space Science Library 444, DOI 10.1007/978-3-319-60051-2_10 179