Interhemispheric structure and variability of the 5-day planetary wave from meteor radar wind measurements

H. Iimura, D. C. Fritts, D. Janches, W. Singer, N. J. Mitchell

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Abstract

A study of the quasi-5-day wave (5DW) was performed using meteor radars at conjugate latitudes in the Northern and Southern hemispheres. These radars are located at Esrange, Sweden (68° N) and Juliusruh, Germany (55° N) in the Northern Hemisphere, and at Tierra del Fuego, Argentina (54° S) and Rothera Station, Antarctica (68° S) in the Southern Hemisphere. The analysis was performed using data collected during simultaneous measurements by the four radars from June 2010 to December 2012 at altitudes from 84 to 96 km. The 5DW was found to exhibit significant short-term, seasonal, and interannual variability at all sites. Typical events had planetary wave periods that ranged between 4 and 7 days, durations of only a few cycles, and infrequent strongly peaked variances and covariances. Winds exhibited rotary structures that varied strongly among sites and between events, and maximum amplitudes up to ~ 20 m sg-1. Mean horizontal velocity covariances tended to be largely negative at all sites throughout the interval studied.

Original languageEnglish
Pages (from-to)1349-1359
Number of pages11
JournalAnnales Geophysicae
Volume33
Issue number11
DOIs
Publication statusPublished - 6 Nov 2015

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wind measurement
planetary wave
meteoroids
Southern Hemisphere
meteor
Northern Hemisphere
planetary waves
radar
Argentina
Sweden
Antarctic regions
Germany
stations
intervals
cycles
analysis
station
Antarctica

Keywords

  • Meteorology and atmospheric dynamics (Middle atmosphere dynamics)

Cite this

Interhemispheric structure and variability of the 5-day planetary wave from meteor radar wind measurements. / Iimura, H.; Fritts, D. C.; Janches, D.; Singer, W.; Mitchell, N. J.

In: Annales Geophysicae, Vol. 33, No. 11, 06.11.2015, p. 1349-1359.

Research output: Contribution to journalArticle

Iimura, H. ; Fritts, D. C. ; Janches, D. ; Singer, W. ; Mitchell, N. J. / Interhemispheric structure and variability of the 5-day planetary wave from meteor radar wind measurements. In: Annales Geophysicae. 2015 ; Vol. 33, No. 11. pp. 1349-1359.
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