Wave-4 pattern of the equatorial mass density anomaly: A thermospheric signature of tropical deep convection

Huixin Liu, Mamoru Yamamoto, Hermann Lühr

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

The equatorial mass density anomaly (EMA) is an anomalous latitudinal distribution of the atmospheric mass density, with its equinox configuration consisting of a density trough near the Earth's dip equator flanked by density crests around ±25° dip latitude. As a novel feature, this study reveals a pronounced 4-peak longitudinal pattern of the EMA, which is in reminiscence of the wave-4 like structure in the neutral wind and the equatorial ionization anomaly (EIA). It is found that the wave-4 modulation in the EMA trough region is in phase with that in the EMA crest region, in contrast to the 180° phase reversal for the case of EIA. This difference strongly suggest that although the latitudinal structure of the EMA is principally caused by the EIA via ion drag, its wave-4 pattern likely arises from different sources. The direct penetration of the nonmigrating diurnal tides DE3 to the F-region height or thermal budget modulation by the composition NO at lower thermosphere are discussed as plausible candidates. Our results reveal a 4-hour phase lag between the wave-4 patterns in neutral density and wind, and a 2% peak-to-peak amplitude of the neutral density wave-4 pattern. These results find good agreements with theoretical predictions based on direct penetration of the DE3 to F-regions heights, hence strongly support this mechanism. Our observations thus add further evidences for the influence of tropical deep convection on the thermosphenc dynamics.

Original languageEnglish
Article numberL18104
JournalGeophysical Research Letters
Volume36
Issue number18
DOIs
Publication statusPublished - Sep 1 2009

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convection
signatures
anomalies
anomaly
ionization
F region
troughs
dip
trough
penetration
wave drag
modulation
thermosphere
tides
equators
budgets
drag
tide
time lag
ion

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Wave-4 pattern of the equatorial mass density anomaly : A thermospheric signature of tropical deep convection. / Liu, Huixin; Yamamoto, Mamoru; Lühr, Hermann.

In: Geophysical Research Letters, Vol. 36, No. 18, L18104, 01.09.2009.

Research output: Contribution to journalArticle

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