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Toward capturing the behaviour of polar cap absorption events in empirical models: A fast, quasi-empirical solar energetic proton module

Research output: Contribution to conference - Without ISBN/ISSN Abstract

  • David Themens
  • Neil Rogers
  • Benjamin Reid
  • Anthony McCaffrey
  • R. A. D. Fiori
  • E. Spanswick
  • Periyadan T. Jayachandran
  • Farideh Honary
  • Sean Elvidge
Publication date19/08/2023
Number of pages1
<mark>Original language</mark>English
EventURSI General Assembly 2023 - Sapporo Convention Center, Sapporo, Japan
Duration: 19/08/202326/08/2023
Conference number: 35


ConferenceURSI General Assembly 2023
Abbreviated titleURSI GASS 2023
Internet address


Solar Energetic Protons (SEPs) strongly modulate the ionization of the high latitude D-Region, often producing severe Polar Cap Absorption (PCA) during large SEP events that can disrupt High Frequency (HF) propagation signal integrity for several days at a time. Many operational models of PCA exist and do a decent job at capturing the overall absorption resulting from these events; however, these models are often either computationally intensive physics-based
models, which attempt to capture the response of the chemically complex D-Region ionization, or are 2D models based on empirical measurements from relative ionospheric opacity meters (riometers). Here we propose a simpler SEP module that is both computationally efficient and performs at a similar, or even better, level to the existing standard. The module itself is based in part on the work of Rogers et al. [2016] with extension to full 3D specification
and improvements in flexibility. This presentation will provide an overview of this module, while also examining its performance and demonstrating a pathway
through which it could be either integrated directly into the International Reference Ionosphere (IRI) or provided as a supplementary tool for IRI users concerned with high latitude HF absorption. An example of the output from this module during the September 2017 SEP event can be found here:

Rogers, N. C., A. Kero, F. Honary, P. T. Verronen, E. M. Warrington, and D. W. Danskin (2016), Improving the twilight model for polar cap absorption nowcasts, Space Weather, 14, 950–972, doi:10.1002/2016SW001527.