Physics
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11702312k&link_type=abstract
Journal of Geophysical Research, Volume 117, Issue A2, CiteID A02312
Physics
Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry, Atmospheric Processes: Thermospheric Dynamics (0358)
Scientific paper
The wave number 4 (wave 4) and wave number 3 (wave 3) longitudinal structures in the thermospheric neutral mass density are understood as tidal structures driven by diurnal eastward propagating zonal wave number 3 (DE3) and wave number 2 (DE2) tides, respectively. However, those structures have been identified using data from limited time periods, and the consistency and recurrence of those structures have not yet been examined using long-term observation data. We examine the persistence of those structures by analyzing the neutral mass density data for the years 2001-2008 taken by the Challenging Minisatellite Payload (CHAMP) satellite. During years of low solar activity the amplitude of the wave 4 structure is pronounced during August and September, and the wave 4 phase shows a consistent eastward phase progression of 90° within 24 h local time in different months and years. During years of high solar activity the wave 4 amplitude is small and does not show a distinctive annual pattern, but the tendency of the eastward phase shift at a rate of 90°/24 h exists. Thus the DE3 signature in the wave 4 structure is considered as a persistent feature. The wave 3 structure is a weak feature in most months and years. The amplitude and phase of the wave 3 structure do not show a notable solar cycle dependence. Among the contributing tidal modes to the wave 3 structure, the DE2 amplitude is most pronounced. This result may suggest that the DE2 signature, although it is a weak signature, is a perceivable persistent feature in the thermosphere.
Kil Hyosub
Kwak Young-Sil
Lee Woo Kyoung
Oh Seung-Jun
Ren Zhipeng
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