SMuK 2021 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 3: Near Earth Space I

EP 3.5: Talk

Tuesday, August 31, 2021, 12:15–12:30, H8

Dependence of the ISS DOSTEL Dorman function on the used external geomagnetic field — •Hanna Giese, Sönke Burmeister, Bernd Heber, Konstantin Herbst, Lisa Romaneehsen, and Carsten Wallmann — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany

The Earth is constantly hit by energetic particles originating from galactic sources. The flux of these particles is altered by the magnetized solar wind in the heliosphere and the Earth's magnetic field. For this reason, the ability of a particle to approach a spacecraft in Low Earth Orbit (LEO) depends on its energy and the position of the spacecraft within the Earth's magnetosphere, characterized by the so-called cut-off rigidity. This cut-off rigidity depends on the activity state of the heliosphere and magnetosphere that are described by models of different complexity. The DOSimetry TELescope (DOSTEL) aboard the International Space Station (ISS) monitors the radiation field within the European module Columbus, which varies with the geomagnetic positions. The correlation between the measured count rates and the corresponding cut-off rigidity is described by the Dorman function. In this contribution we compute cut-off rigidities along the ISS trajectory utilizing three Earth magnetosphere models during different solar and magnetospheric activity. As a result we find major differences between the resulting Dorman functions, which depend on and increase with the external solar wind pressure and exceed the uncertainty in intervals with a mean solar wind pressure of more than 3nPa.