Planetary waves and midlatitude sporadic E layers: Strong experimental evidence for a close relationship

Details Planetary waves and midlatitude sporadic E layers: Strong experimental evidence for a close relationship Planetary waves and midlatitude sporadic E layers: Strong experimental evidence for a close relationship

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1078h&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A6, pp. SIA 3-1, CiteID 1078, DOI 10.1029/2001JA000212

Physics

Space Physics

14

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

A large-amplitude, 7-day period westward propagating S = 1 planetary wave has been reported from ground radar and satellite wind measurements in the mesosphere lower thermosphere (MLT) during the second half of August and well into September 1993. Following recent suggestions that planetary waves might play a role in the formation of midlatitude sporadic E layers (Es), we have obtained and analyzed, for the period from August 1 to September 30, 1993, the sporadic E critical frequency (foEs) time series from eight midlatitude ionosonde stations covering a large longitudinal zone from ~58°E to 157°W. The analysis revealed that all eight station foEs data showed a strong 7-day periodicity, occurring concurrently with the 7-day planetary wave reported elsewhere. Using independent methods for the analysis of the foEs time series, we computed identical estimates for the propagation direction, zonal wave number, and phase velocity of the 7-day wave, which are in agreement with those reported from radar and satellite neutral wind MLT measurements. The present findings provide the first direct evidence, proving that planetary waves play an important role in the physics of midlatitude sporadic E region layers. In addition, our results include an important implication, that the Es parameters measured routinely and rather reliably with a dense global network of digital ionosondes, as well as the enormous ionogram databases existing in World Data Centers, may be used as an alternative means of studying large-scale neutral atmospheric dynamics in the MLT region.

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