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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-68
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-68
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 10 May 2019

Regular paper | 10 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Multi-point galactic cosmic rays measurements between 1 and 4.5 AU over a full Solar cycle

Thomas Honig1, Olivier G. Witasse1, Hugh Evans1, Petteri Nieminen1, Erik Kuulkers1, Matt G. G. T. Taylor1, Bernd Heber2, Jingnan Guo2, and Beatriz Sánchez-Cano3 Thomas Honig et al.
  • 1European Space Agency, ESTEC, Noordwijk, 2200 AG, the Netherlands
  • 2Institute of Experimental and Applied Physics, Christian-Albrechts-Universitycity, Kiel, Germany
  • 3Department of Physics and Astronomy, University of Leicester, Leicester, UK

Abstract. The radiation data collected by the Standard Radiation Environment Monitor (SREM) aboard ESA missions INTEGRAl, ROSETTA, HERSCHEL, PLANCK and PROBA-1, and by the High Energy Neutron Detector (HEND) instrument aboard Mars Odyssey are analysed with an emphasis on characterising Galactic Cosmic Rays (GCRs) in the inner heliosphere. A cross-calibration between all sensors was performed for this study, which can also be used in subsequent works. We investigate the stability of the SREM detectors over long-term periods. The radiation data is compared qualitatively and quantitatively with the corresponding solar activity. Based on INTEGRAL and Rosetta SREM data, a GCR helioradial gradient of 2.96 %/AU is found between 1 and 4.5 AU. In addition, the data during the last phase of the Rosetta mission around comet 67P/Churyumov-Gerasimenko were studied in more detail. An unexpected and yet unexplained 8 % reduction of the Galactic Comic Ray flux measured by Rosetta SREM in the vicinity of the comet is noted.

Thomas Honig et al.
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Thomas Honig et al.
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Latest update: 21 Jul 2019
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Short summary
We have analysed data from radiation monitors on board different spacecraft such as Rosetta and Integral. From the data, we extracted the evolution of galactic cosmic rays as a function of time (over a full solar cycle) and position (from 1 to 4.5 astronomical units). As main results, we confirm the overall evolution (anti-correlation) of the fluxes with respect to the solar activity. We found a surprising result, which is a decrease of the flux of galactic cosmic rays around comet 67P.
We have analysed data from radiation monitors on board different spacecraft such as Rosetta and...
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