@PhdThesis{diss_mods_00021647, author = {K{\"u}hl, Patrick}, title = {Energy Spectra of near relativistic Galactic Cosmic Rays and Solar Energetic Particles: Extending the Measurement Capabilities of EPHIN}, year = {2017}, publisher = {Christian-Albrechts-Universit{\"a}t zu Kiel}, address = {Kiel}, keywords = {galactic cosmic rays; solar energetic particles; EPHIN; galaktische kosmische Strahlung; solare energiereiche Teilchen}, abstract = {Measurements of the energy spectra of particles in the heliosphere are of major importance in order to understand basic physical acceleration and transport processes. Furthermore, understanding their temporal variations is crucial with regard to their impact in dosimetry for future manned space missions. The two main components of particles in the heliosphere with energies above 100 MeV are the sporadic Solar Energetic Particle (SEP) events and Galactic Cosmic Rays (GCR), which have their intensity and energy spectrum modulated by the Sun on time scales of up to several years. In this work, the observable energy range of the Electron Proton Helium Instrument (EPHIN) onboard the Solar and Heliospheric Observatory (SOHO) was increased with detailed simulations of the instrument and its response to energetic particles. Since the developed method can be applied to data already taken by the instrument, energy spectra for protons between 100 MeV and above 1 GeV were derived for the entire SOHO mission and therefore significantly extend the available data sets for SEP events and GCRs in terms of energy and time coverage. The annual proton spectra from 1995 to 2014 have been derived in an energy range from 250 MeV up to 1.6 GeV and discussed with a focus on drift effects. Furthermore, the possibility to apply the new method to Helium and heavy ions has been examined. SEP events have been investigated by statistical means utilizing the continous measurements from EPHIN . For this purpose, the SEP events with an increase in the intensity of protons above energies of 500 MeV which occured between 1995 and 2015 have been identified. The spectral properties of these events have been calculated and analysed with special emphasis on whether or not the event has been detected by ground-based instruments, i.e. Neutron Monitors.}, url = {https://macau.uni-kiel.de/receive/diss_mods_00021647}, file = {:https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00007284/Dissertation_Kuehl_Patrick.pdf:PDF}, language = {en} }