Preprints
https://doi.org/10.5194/egusphere-2022-39
https://doi.org/10.5194/egusphere-2022-39
28 Mar 2022
 | 28 Mar 2022

On the use of high frequency surface wave oceanographic research radars as bistatic single frequency oblique ionospheric sounders

Stephen R. Kaeppler, Ethan S. Miller, Daniel Cole, and Teresa Updyke

Abstract. We demonstrate that bistatic reception of high frequency oceanographic radars can be used as single frequency oblique ionospheric sounders. We develop methods that are agnostic of the software defined radio system to estimate the group range from the bistatic observations. The group range observations are further used to estimate virtual height and equivalent vertical frequency at the midpoint of the oblique propagation path. Uncertainty estimates of the virtual height and equivalent vertical frequency are presented. We apply this analysis to observations collected from two experiments, run at two locations in different years, but utilizing similar software defined radio data collection systems. In the first experiment, 10 days of data were collected in March 2016 at a site located in Maryland, USA, while the second experiment collected 20 days of data in October 2020 at a site located in South Carolina, USA. In both experiments, three Coastal Oceanographic Dynamics and Applications Radars (CODARs) located along the North Carolina coast of the US were bistatically observed at 4.53718 MHz. The virtual height and equivalent virtual frequency were estimated in both experiments and compared with contemporaneous observations from a vertical incident Digisonde ionosonde at Wallops Island, VA, USA. We find good agreement in both experiments between the virtual height derived from the oblique CODAR observations versus the virtual height observed with the Digisonde at the same frequency. Variations in the virtual height from CODAR observations and the Digisonde are found to be nearly in phase with each other. We conclude from this investigation that observations that oceanographic radar can be used as single frequency oblique incidence sounders. We discuss applications with respect to investigations of traveling ionospheric disturbances, studies of day-to-day ionospheric variability, and using these observations in data assimilation.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Share

Journal article(s) based on this preprint

10 Aug 2022
On the use of high-frequency surface wave oceanographic research radars as bistatic single-frequency oblique ionospheric sounders
Stephen R. Kaeppler, Ethan S. Miller, Daniel Cole, and Teresa Updyke
Atmos. Meas. Tech., 15, 4531–4545, https://doi.org/10.5194/amt-15-4531-2022,https://doi.org/10.5194/amt-15-4531-2022, 2022
Short summary
Download

The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
This investigation demonstrates how useful ionospheric parameters can be extracted from existing...
Share