2009
DOI: 10.1186/bf03353164
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Gravity waves in the equatorial thermosphere and their relation to lower atmospheric variability

Abstract: Using a general circulation model that contains the region from the ground surface to the upper thermosphere, we have examined characteristics of gravity waves in the equatorial thermosphere. At an altitude of 150 km, the dominant periods of gravity waves for zonal wave number 20 (zonal wavelength λ x ≈ 2000 km), 40 (λ x ≈ 1000 km) and 80 (λ x ≈ 500 km) are 3, 1.5 and 1 h, respectively. For individual zonal wave numbers, the corresponding dominant period becomes shorter at higher altitudes due to dissipation p… Show more

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Cited by 15 publications
(17 citation statements)
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“…The studies of the previous model showed that the dominant horizontal phase velocity of the GWs increases with increasing height (Miyoshi & Fujiwara, , ). In other words, GWs with slow phase speeds cannot penetrate the upper thermosphere due to the molecular viscosity and thermal conductivity of the thermosphere (Vadas & Fritts, ).…”
Section: Resultsmentioning
confidence: 99%
“…The studies of the previous model showed that the dominant horizontal phase velocity of the GWs increases with increasing height (Miyoshi & Fujiwara, , ). In other words, GWs with slow phase speeds cannot penetrate the upper thermosphere due to the molecular viscosity and thermal conductivity of the thermosphere (Vadas & Fritts, ).…”
Section: Resultsmentioning
confidence: 99%
“…Miyoshi and Fujiwara [, hereafter M08] developed a GW‐resolving GCM and investigated the characteristics of GWs propagating from the troposphere to the thermosphere. Miyoshi and Fujiwara [, hereafter M09] and Miyoshi et al . [, hereafter M14] showed the global distribution and diurnal variation of the GW drag in the thermosphere.…”
Section: Introductionmentioning
confidence: 99%
“…The observed differences in the GW wave variances between the two radar sites may represent latitudinal variability, though it is more probable that the differences occur due to the wave sources. A study made by Miyoshi and Fujiwara [2009] showed the longitudinal variation in GW energy in the equatorial thermosphere correlated with that of the convective activity in the tropical troposphere. We discuss this topic further in section 4.1.…”
Section: Discussionmentioning
confidence: 99%
“…To explore the relationship between the deep tropical convection and gravity wave variability observed at MLT heights, we need information on lower‐atmospheric sources that generate GWs. As the generation of atmospheric waves in the troposphere is related to convective activity, OLR (outgoing long‐wave radiation)/cloud top temperature has been used in many studies [ Wheeler and Kildas , 1999; Miyoshi and Fujiwara , 2009] as an index of wave excitation intensity. To examine the relationship between GW intensities and convective activity, we use two types of data sets, namely, (1) daily OLR which is available at 2.5° × 2.5° grid from National Oceanic and Atmospheric Administration (NOAA) satellite data and (2) rain rates available from the Tropical Rainfall Measuring Mission (TRMM) satellite data archive.…”
Section: Data Collection and Analysismentioning
confidence: 99%