4.5 Article

A Comparison of Cross-Track Ion Drift Measured by the Satellites and Plasma Convection Velocity Measured by SuperDARN

Journal

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 124, Issue 6, Pages 4710-4724

Publisher

AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JA026245

Keywords

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Funding

  1. Canadian Space Agency's Geospace Observatory (GO Canada) continuation initiative
  2. Italian National Research Council
  3. National Program for Antarctic Research
  4. NSERC Discovery grant
  5. NSERC USRA
  6. CSA

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Cross-track ion drifts measured by the Swarm A satellite are compared with colocated line-of-sight Super Dual Auroral Radar Network (SuperDARN) velocities in approximately the same directions. More than 200 Swarm A passes over four polar cap SuperDARN radars in the Northern and Southern Hemispheres are considered. Overall, the Swarm-based velocities are larger than the SuperDARN velocities; the slope of the best fit line to the data is similar to 0.67. Somewhat stronger differences are found when Swarm A measurements for the entire year 2016 are compared with SuperDARN vector data from global-scale convection maps. Swarm ion drift data demonstrate known features of the high-latitude convection patterns, for example, reverse convection cells at interplanetary magnetic field B-z > 0. The latitudes of the convection reversal boundary inferred from SuperDARN are found to be in reasonable agreement with those determined from Swarm A and Swarm B, with Swarm-based latitudes occurring roughly 1 degrees more equatorward, typically.

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