Quantifying Geomagnetic Activity's Contribution to the Global E-Region Electron Density's Day-To-Day Variability Using Spire Radio Occultation Observations
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45691
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Salinas, Cornelius Csar Jude H., Dong L. Wu, and Liying Qian. "Quantifying Geomagnetic Activity’s Contribution to the Global E-Region Electron Density’s Day-To-Day Variability Using Spire Radio Occultation Observations". Geophysical Research Letters 52, no. 3 (2025): e2024GL112874. https://doi.org/10.1029/2024GL112874.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
Using the unprecedented sampling of the Spire Radio Occultation (RO) data set, this paper statistically estimates geomagnetic dependencies of the global E-region Electron Density's (Ne) day-to-day variability. To assesses how much Spire RO-observed variabilities are consistent with known Physics, comparison is made with the Specified Dynamics–Whole Atmosphere Community Climate Model with Ionosphere/Thermosphere eXtension (SD-WACCM-X), a first principles Physics-based model. Results show that the largest geomagnetic dependency on Spire and SD-WACCM-X E-region Ne occurs at night over the auroral latitudes with coefficients of determination at around 49% and 80%, respectively. Their regression coefficients are both between +10%/Kp index to +16%/Kp index. On the other hand, Spire and SD-WACCM-X substantially disagree on the geomagnetic dependencies during day-time. These results suggest that Spire RO's observations of E-region Ne geomagnetic dependencies may only be substantially explained by known physics at night and not during the day.