Regensburg 2007 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 7: Solar-Terrestrische Beziehungen

EP 7.5: Vortrag

Dienstag, 27. März 2007, 17:30–17:45, H46

Comparison of calculated CME parameters based on Neutron monitor measurements with measured data — •Manfred Thomann, Christian Steigies, Robert Wimmer-Schweingruber, and Bernd Heber — Christian Albrechts Universität, 24098 Kiel, Germany

Solar energetic particle events have been measured by neutron monitors for many years. Only 70 of these increases are detected until now and in comparison with intensity decreases, called Forbush decrease (Fd), they are "‘rare"’. While the corresponding plasma parameters can only be measured by satellites, neutron monitors provide the possibility to determine the particle environment outside the earth’s magnetosphere by simulation calculations. The energy range detected by neutron monitors is defined by the cutoff rigidity for the station, which avoids measurements of particles with lower rigidity, and the detection efficiency for different energies, so different stations see different parts of the energy spectra. Using the world wide neutron monitor network data this presentation will show possibilities and limitations of simulation calculations by means of events during highly and slightly disturbed magnetosphere.