lower thermosphere
Comparison of global datasets of sodium densities in the mesosphere and lower thermosphere from GOMOS, SCIAMACHY and OSIRIS measurements and WACCM model simulations from 2008 to 2012
... Abstract. During the last decade, several limb sounding satellites have measured the global sodium (Na) number den- sities in the mesosphere and lower thermosphere (MLT). Datasets are now available from ...
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Some results of S transform analysis of the transient planetary scale wind oscillations in the lower thermosphere
... Further evidence of the complex longitudinal structure of the day-to-day variations, which are usually considered as a manifestation of a planetary wave propagation in the lower thermosphere, was obtained ...
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The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3 N; 13.0 E), 2004–2011
... The dynamics of the mesosphere and lower thermosphere (MLT) are strongly influenced by atmospheric waves, in- cluding the solar tides with periods of a solar day and its harmonics. Their wind amplitudes ...
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Novel specular meteor radar systems using coherent MIMO techniques to study the mesosphere and lower thermosphere
... Abstract. Typical specular meteor radars (SMRs) use one transmitting antenna and at least a five-antenna interfero- metric configuration on reception to study the mesosphere and lower thermosphere (MLT) ...
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Retrieval of sodium number density profiles in the mesosphere and lower thermosphere from SCIAMACHY limb emission measurements
... Abstract. An algorithm has been developed for the retrieval of sodium atom (Na) number density on a latitude and altitude grid from SCIAMACHY (SCanning Imaging Ab- sorption spectroMeter for Atmospheric CHartographY) limb ...
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Kelvin waves in stratosphere, mesosphere and lower thermosphere temperatures as observed by TIMED/SABER during 2002–2006
... the lower stratosphere commonly occur with periods of or- der 10–20 days and are known as “slow” Kelvin waves or “Wallace-Kousky” waves (Wallace and Kousky, 1968; Maruyama, ...overlying thermosphere. The ...
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Connection between the length of day and wind measurements in the mesosphere and lower thermosphere at mid and high latitudes
... fect the atmospheric density, temperature, chemical compo- sition, and winds over the whole atmosphere, but in particu- lar in the MTI (mesosphere–thermosphere–ionosphere) sys- tem. A model simulation by Marsh et ...
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Seasonal variability of atmospheric tides in the mesosphere and lower thermosphere: meteor radar data and simulations
... and lower thermosphere (MLT) is characterised by a variety of waves including at- mospheric gravity waves (GWs), tides, and planetary waves ...the thermosphere and ...
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El Niño–Southern Oscillation effect on quasi biennial oscillations of temperature diurnal tides in the mesosphere and lower thermosphere
... The stratospheric QBO can affect the tidal variation in the MLT region (e.g., Hagan et al. 1999; Forbes et al. 2008; Oberheide et al. 2009; Gan et al. 2014). Diurnal tides interact with the zonal mean zonal wind fields ...
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Three-dimensional tomographic reconstruction of atmospheric gravity waves in the mesosphere and lower thermosphere (MLT)
... Abstract. Gravity waves (GWs) have been intensively stud- ied over recent decades because of their dominant role in the dynamics of the mesosphere and lower thermosphere (MLT). The momentum deposition ...
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Radar observations of the diurnal tide in the tropical mesosphere lower thermosphere region: Longitudinal variabilities
... Significant attention is being paid in recent times by several observational and modeling studies to quantify the spatial and temporal variabilities of diurnal tide in the mesosphere and lower thermosphere ...
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The terdiurnal tide in the mesosphere and lower thermosphere over Wuhan (30°N, 114°E)
... Ground-based and satellite-based measurements and the- oretical studies have greatly enriched our knowledge on the diurnal (24-hour) and semidiurnal (12-hour) tides in the mesosphere/lower thermosphere ...
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Identification of possible ion drag induced neutral instability in the lower thermosphere over Svalbard
... Hitherto, we have presented characteristics of the iono- spheric plasma. Let us now explore how this information may be used to explore the neutral atmosphere, in particular the state of dynamic stability as affected by ...
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Joule heating due to vertical ion currents in the lower thermosphere over the dip equator
... The theory of equatorial electrojet predicts the presence of vertical ion currents (Pedersen currents) as a part of the electrojet current system. The vertical ion current density profile over the dip equator, that forms ...
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MIPAS temperature from the stratosphere to the lower thermosphere: Comparison of vM21 with ACE-FTS, MLS, OSIRIS, SABER, SOFIE and lidar measurements
... Differences above 85 km in the summer high latitudes are larger than under any other conditions examined. MIPAS mesopause ( ≈ 88 km) temperatures also lie within the other instrument measurements, but the differences (in ...
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Do minor sudden stratospheric warmings in the Southern Hemisphere (SH) impact coupling between stratosphere and mesosphere–lower thermosphere (MLT) like major warmings?
... Stratosphere and MLT coupling: zonal wind variations In this section, we present the SSW effects on the meso- sphere and lower thermosphere zonal winds obtained by KSS MR and computed by SD-WACCM and GAIA ...
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El Niño influence on the mesosphere/lower thermosphere circulation at midlatitudes as seen by a VHF meteor radar at Collm (51.3 N, 13 (E)
... Mesosphere/lower thermosphere (MLT) zonal winds continuously measured by a VHF meteor radar at Collm, Germany ...easterly lower thermospheric ...
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Retrieval of O 21 and O 21 volume emission rates in the mesosphere and lower thermosphere using SCIAMACHY MLT limb scans
... scans were scheduled in place of the nominal mode scans and there were 20 limb scans along one semi-orbit. Overall 84 days of mesosphere and lower thermosphere limb mea- surements were carried out. In this ...
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Some results of comparison between the lower thermosphere zonal winds as seen by the ground based radars and WINDII on UARS
... Various global empirical wind models play an important role in our understanding of main regularities in the upper mesosphere/lower thermosphere dynamics. Among others, the models derived from the ...
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Cooperative wind observation in the upper mesosphere and lower thermosphere with foil chaff technique, the MU radar, and Yamagawa MF radar
... An in-situ rocket technique using foil chaff is used to observe wind fields in the mesosphere and lower thermosphere (80–98 km in altitude). We launched two micro-rockets at 1200 and 1315 UT on 14 January ...
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