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- W2061516301 abstract "[1] Density measurements from the SETA satellites near 200 km during 1982–1984, and the CHAMP and GRACE satellites between 350 and 550 km during 2002–2009, are used to investigate longitudinal structures in density due to nonmigrating tides, and to evaluate performance of the recently-created Climatological Tidal Model of the Thermosphere (CTMT). Amplitudes for the diurnal and semidiurnal tidal components fall roughly in the range of 4–10%. Diurnal tides at middle and low latitudes are often characterized by wave-3 and/or wave-4 structures, consistent with the presence of the eastward-propagating diurnal tides with zonal wave numberss = 2 and s = 3 (DE2 and DE3, respectively) and with expected seasonal variability based on previous works. Semidiurnal structures often reflect the presence of the eastward-propagating tide withs = 2 (SE2), which gives rise to wave-4 structures that have a more antisymmetric relationship between N. and S. hemispheres. Similarities in structures between different years underscore the fact that the thermosphere is subject to repeatable and reproducible forcing by upward-propagating tides, but there are also occasions where considerable departures from climatology occur. Wave-2 structures at high latitudes likely contain signatures of the eastward-propagating diurnal tide withs = 1 (DE1) and the zonally-symmetric (s = 0) semidiurnal oscillation (S0) propagating upwards from below, but these and other waves that produce wave-2 can also be forced in-situ by high-latitude processes. The CTMT captures the salient features of the observations at middle and low latitudes, although with lower amplitudes that are likely due to phase cancelation effects resulting from averaging over multiple years (2002–2006). We propose that some discrepancies between the CTMT and our observational results may be associated with wave components arising in-situ in the thermosphere as the result of nonlinear tide-tide interactions and plasma neutral interactions, the latter being especially prominent at high latitudes where the displaced geomagnetic frame is particularly influential. Modeling studies are required to validate these proposed mechanisms, however." @default.
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- W2061516301 date "2012-11-01" @default.
- W2061516301 modified "2023-10-16" @default.
- W2061516301 title "Middle and upper thermosphere density structures due to nonmigrating tides" @default.
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- W2061516301 doi "https://doi.org/10.1029/2012ja018087" @default.
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