Abstract
The Ion Velocity Meter (IVM) on NASA’s Ionospheric Connection Explorer (ICON) reports the in-situ ion density, ion temperature and 3-component ion drift velocity, retrieved from measurements by a retarding potential analyzer and an ion drift meter. ICON was launched during a deep solar minimum in late 2019, followed by a solar quiet (F10.7 < 80) period until September 2020. In order to quantify the uncertainties in the IVM’s drift velocity in a low plasma density environment, we compared IVM’s vertical drift velocity with eastward electric field (EEF) obtained from Swarm’s equatorial electrojet current measurements, the vertical drift from ground-based incoherent scatter radar (ISR) at Jicamarca Radio Observatory (JRO) and from Jicamarca Unattended Long-term studies of Ionosphere and Atmosphere (JULIA) coherent mode. The main results of this study show that (1) the vertical drift derived from Swarm’s EEF and ISR are in good agreement with the zonal electric field derived from JULIA’s vertical drift regardless of the F10.7 value. (2) The zonal electric field derived from IVM’s meridional drift is in good agreement with Swarm’s EEF in 2021, whereas the distribution is highly scattered in the deepest solar minimum in 2020. (3) An ad hoc IVM correction based on the 24-hour running mean of meridional drift can bring the IVM data into better agreement with Swarm and JULIA. An additional quality control based on O+ fractional composition may be needed for some studies using IVM’s vertical drift. By using the same methodology presented in this work, future missions could calibrate their drift measurements to facilitate meaningful integration with ICON/IVM observations through the comparision with ground-based measurements.
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Acknowledgements
The authors wish to express their gratitude to the engineering team and science data center of ICON. Special thanks to Rod Heelis for the valuable and insightful discussion. YJW wish to thank Claire Gasque and Colin Triplett for the valuable discussion to improve the quality of the paper. The work is supported by the Ionospheric CONnection Explorer (ICON) project contract number NNG12FA45C. BJH acknowledges funding by NSF AGS-2230365. The Jicamarca Radio Observatory is a facility of Instituto Geofísico del Perú operated with support of the NSF AGS-1732209 through Cornell University. AM is supported by ICON NASA grant 80NSSC21K1990. The ICON data is available at Space Physics Data Facility (SPDF) https://spdf.gsfc.nasa.gov/pub/data/icon/ and ICON science data center at UC Berkeley https://icon.ssl.berkeley.edu/Data. The authors would like to acknowledge the European Space Agency for making Swarm data available. The Swarm EEF data is available at https://swarm-diss.eo.esa.int/#swarm%2FLevel2daily%2FEntire_mission_data%2FEEF%2FTMS. F10.7 data is available at the OMNIWeb https://omniweb.gsfc.nasa.gov.
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The Ionospheric Connection Explorer (ICON) Mission: First Results
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Wu, YJ.J., Mende, S., Harding, B.J. et al. Cross-Validation of the Ionospheric Vertical Drift Measurements Based on ICON/IVM, Swarm, and the Ground-Based Radar at the Jicamarca Radio Observatory. Space Sci Rev 219, 47 (2023). https://doi.org/10.1007/s11214-023-00993-9
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DOI: https://doi.org/10.1007/s11214-023-00993-9