Quantification of magnetosphere–ionosphere coupling timescales using mutual information: response of terrestrial radio emissions and ionospheric–magnetospheric currents

Fogg, Alexandra Ruth; Jackman, Caitríona M.; Chapman, Sandra C.; Waters, James E.; Bergin, Aisling; Lamy, Laurent; Issautier, Karine; Cecconi, Baptiste; Bonnin, Xavier

doi:https://doi.org/10.5194/npg-31-195-2024

Articles | Volume 31, issue 2

https://doi.org/10.5194/npg-31-195-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/npg-31-195-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 31, issue 2

Research article

|

10 Apr 2024

Research article |

| 10 Apr 2024

Quantification of magnetosphere–ionosphere coupling timescales using mutual information: response of terrestrial radio emissions and ionospheric–magnetospheric currents

Alexandra Ruth Fogg, Caitríona M. Jackman, Sandra C. Chapman, James E. Waters, Aisling Bergin, Laurent Lamy, Karine Issautier, Baptiste Cecconi, and Xavier Bonnin

Data sets

Wind/Waves flux density collection calibrated for Auroral Kilometric Radiation (Version 1.0) J. E. Waters et al. https://doi.org/10.25935/wxv0-vr90

OMNI 1-min Data N. E. Papitashvili and J. H. King https://doi.org/10.48322/45bb-8792

OMNIWeb Plus N. Papitashvili https://omniweb.gsfc.nasa.gov/hw.html

Geomagnetic AE index World Data Center for Geomagnetism Kyoto et al. https://doi.org/10.17593/15031-54800

Model code and software

aaft Lneiseman https://github.com/lneisenman/aaft

arfogg/generic_MI_lag_finder: First release of the mutual information lag finding tool (v1.0.0) Alexandra Ruth Fogg https://doi.org/10.5281/zenodo.10804655

Short summary

Auroral kilometric radiation (AKR) is a radio emission emitted by Earth. Due to the complex mixture of phenomena in the magnetosphere, it is tricky to estimate the time difference between the excitation of two systems. In this study, AKR is compared with indices describing Earth's system. Time differences between the excitation of AKR and the indices are estimated using mutual information. AKR feels an enhancement before the aurora but after more polar latitude features.