Articles | Volume 44, issue 1
https://doi.org/10.5194/angeo-44-263-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-44-263-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
09 Apr 2026
Regular paper |
| 09 Apr 2026
| 09 Apr 2026
Subauroral contamination in POES/Metop TED channels
German Aerospace Center (DLR), Institute for Solar-Terrestrial Physics, Neustrelitz, Germany
Olesya Yakovchuk
Institute of Physics, University of Rostock, Rostock, Germany
Stefan Bender
Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain
Christina Arras
GFZ Helmholtz-Centre for Geosciences, Potsdam, Germany
Berlin University of Technology, Berlin, Germany
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Revised manuscript not accepted
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We investigated a subauroral particle flux maximum (located at 60 N/S with focus at 0–100 E) seen in the NOAA POES detector, which we attributed to crosstalk contamination of radiation belt electrons. Affected are the processed TED proton channels (which should already be corrected by NOAA) and lower MEPED channels. The particle flux in the contaminated area can be more than factor 2 higher than typical auroral flux. The region of intense particle crosstalk may be removed by a latitudinal cut.
Monali Borthakur, Miriam Sinnhuber, Alexandra Laeng, Thomas Reddmann, Peter Braesicke, Gabriele Stiller, Thomas von Clarmann, Bernd Funke, Ilya Usoskin, Jan Maik Wissing, and Olesya Yakovchuk
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Reduced ozone levels resulting from ozone depletion mean more exposure to UV radiation, which has various effects on human health. We analysed solar events to see what influence it has on the chemistry of Earth's atmosphere and how this atmospheric chemistry change can affect the ozone. To do this, we used an atmospheric model considering only chemistry and compared it with satellite data. The focus was mainly on the contribution of chlorine, and we found about 10 %–20 % ozone loss due to that.
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Short summary
We investigate the subauroral flux maximum (at 60° N/S geomagetic) observed in low-energy particle channels. Two independent atmospheric impact measurements refute the subauroral flux under low Kp, pointing to instrumental contamination, likely from energetic electrons. We propose correction methods to mitigate contamination, ensuring accurate ionization estimates. Without correction, subauroral flux overestimates thermospheric ionization, underscoring the need for data refinement.
We investigate the subauroral flux maximum (at 60° N/S geomagetic) observed in low-energy...
