Annales Geophysicae (Dec 2020)

Migrating tide climatologies measured by a high-latitude array of SuperDARN HF radars

  • W. E. van Caspel,
  • W. E. van Caspel,
  • P. J. Espy,
  • P. J. Espy,
  • R. E. Hibbins,
  • R. E. Hibbins,
  • J. P. McCormack

DOI
https://doi.org/10.5194/angeo-38-1257-2020
Journal volume & issue
Vol. 38
pp. 1257 – 1265

Abstract

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This study uses hourly meteor wind measurements from a longitudinal array of 10 high-latitude SuperDARN high-frequency (HF) radars to isolate the migrating diurnal, semidiurnal, and terdiurnal tides at mesosphere–lower-thermosphere (MLT) altitudes. The planetary-scale array of radars covers 180∘ of longitude, with 8 out of 10 radars being in near-continuous operation since the year 2000. Time series spanning 16 years of tidal amplitudes and phases in both zonal and meridional wind are presented, along with their respective annual climatologies. The method to isolate the migrating tides from SuperDARN meteor winds is validated using 2 years of winds from a high-altitude meteorological analysis system. The validation steps demonstrate that, given the geographical spread of the radar stations, the derived tidal modes are most closely representative of the migrating tides at 60∘ N. Some of the main characteristics of the observed migrating tides are that the semidiurnal tide shows sharp phase jumps around the equinoxes and peak amplitudes during early fall and that the terdiurnal tide shows a pronounced secondary amplitude peak around day of year (DOY) 265. In addition, the diurnal tide is found to show a bi-modal circular polarization phase relation between summer and winter.