Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/38477
Title: A model providing long-term datasets of energetic electron precipitation during geomagnetic storms
Authors: van de Kamp, M
Seppälä, A.
Clilverd, M. A.
Rodger, C. J.
Verronen, P. T.
Whittaker, I. C.
First Published: 6-Oct-2016
Publisher: American Geophysical Union (AGU), Wiley
Citation: Journal of Geophysical Research: Atmospheres, 2016
Abstract: The influence of solar variability on the polar atmosphere and climate due to energetic electron precipitation (EEP) has remained an open question largely due to lack of a long-term EEP forcing dataset that could be used in chemistry-climate models. Motivated by this we have developed a model for 30–1000keV radiation belt driven EEP. The model is based on precipitation data from low-Earth orbiting POES satellites in the period 2002-2012 and empirically described plasmasphere structure, which are both scaled to a geomagnetic index. This geomagnetic index is the only input of the model and can be either Dst or Ap. Because of this, the model can be used to calculate the energy-flux spectrum of precipitating electrons from 1957 (Dst) or 1932 (Ap) onwards, with a time resolution of 1 day. Results from the model compare well with EEP observations over the period of 2002–2012. Using the model avoids the challenges found in measured datasets concerning proton contamination. As demonstrated, the model results can be used to produce the first ever >80 year long atmospheric ionization rate dataset for radiation belt EEP. The impact of precipitation in this energy range is mainly seen at altitudes 70-110km. The ionization rate dataset, which is available for the scientific community, will enable simulations of EEP impacts on the atmosphere and climate with realistic EEP variability. Due to limitations in this first version of the model, the results most likely represent an underestimation of the total EEP effect.
DOI Link: 10.1002/2015jd024212
ISSN: 2169-897X
eISSN: 2169-8996
Links: http://onlinelibrary.wiley.com/doi/10.1002/2015JD024212/abstract
http://hdl.handle.net/2381/38477
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: http://creativecommons.org/licenses/by-nc-nd/4.0/ Archived with reference to SHERPA/RoMEO and publisher website.
Description: We would like to thank the geomagnetic data suppliers and the World Data Center for Geomagnetism, Kyoto, for making the Dst index data available via http://wdc.kugi.kyoto-u.ac.jp. The NOAA/POES data used in this study were made available by the National Oceanic and Atmospheric Administration. AARDDVARK data are available from the AARDDVARK Konsortia (see http://www.physics.otago.ac.nz/space/AARDDVARK_homepage.htm). Other data presented in the paper are available from the corresponding author (annika.seppala@fmi.fi).
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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