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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/angeo-2020-47
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2020-47
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Jul 2020

09 Jul 2020

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This preprint is currently under review for the journal ANGEO.

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

Willem E. van Caspel1,2, Patrick J. Espy1,2, Robert E. Hibbins1,2, and John P. McCormack3 Willem E. van Caspel et al.
  • 1Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
  • 2Birkeland Centre for Space Science, Bergen, Norway
  • 3Space Science Division, Naval Research Laboratory, Washington DC, USA

Abstract. This study uses hourly meteor wind measurements from a longitudinal array of 10 high-latitude SuperDARN HF-radars to isolate the migrating diurnal, semidiurnal and terdiurnal tidal modes at Mesosphere-Lower-Thermosphere (MLT) heights. The planetary-scale array of radars covers 180 degrees of longitude, with eight 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 tidal modes from SuperDARN meteor winds is validated using two years of winds from NAVGEM-HA (Navy Global Environmental Model – High Altitude). 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 late summer, and that the terdiurnal tide shows a pronounced secondary amplitude peak around DOY 260. In addition, the diurnal tide is found to show a bi-modal circular polarization phase relation between summer and winter.

Willem E. van Caspel et al.

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Willem E. van Caspel et al.

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Latest update: 11 Aug 2020
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Short summary
We use a global-scale network of wind measurements of the upper regions of the atmosphere, the Mesosphere-and-Lower-Thermosphere, to uniquely identify the long-term characteristics of atmospheric (tidal) waves that follow the apparent motion of the sun over the course of a day. The steps outlined to validate our tidal measurements also provide a methodology for future studies of atmospheric waves using wind measurements from the (ever expanding) network of SuperDARN radars.
We use a global-scale network of wind measurements of the upper regions of the atmosphere, the...
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