Research output: Contribution to conference - Without ISBN/ISSN › Abstract
Research output: Contribution to conference - Without ISBN/ISSN › Abstract
}
TY - CONF
T1 - Toward capturing the behaviour of polar cap absorption events in empirical models
T2 - URSI General Assembly 2023
AU - Themens, David
AU - Rogers, Neil
AU - Reid, Benjamin
AU - McCaffrey, Anthony
AU - Fiori, R. A. D.
AU - Spanswick, E.
AU - Jayachandran, Periyadan T.
AU - Honary, Farideh
AU - Elvidge, Sean
N1 - Conference code: 35
PY - 2023/8/19
Y1 - 2023/8/19
N2 - 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-basedmodels, 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 specificationand improvements in flexibility. This presentation will provide an overview of this module, while also examining its performance and demonstrating a pathwaythrough 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:https://youtu.be/pSbk1kVY7pcReferencesRogers, 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.
AB - 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-basedmodels, 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 specificationand improvements in flexibility. This presentation will provide an overview of this module, while also examining its performance and demonstrating a pathwaythrough 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:https://youtu.be/pSbk1kVY7pcReferencesRogers, 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.
U2 - 10.46620/URSIGASS.2023.1710.OEHR4400
DO - 10.46620/URSIGASS.2023.1710.OEHR4400
M3 - Abstract
Y2 - 19 August 2023 through 26 August 2023
ER -