Nonmigrating diurnal tides observed in global thermospheric winds

Lieberman, R. S.; Oberheide, J.; Talaat, E. R.

doi:10.1002/2013ja018975

Cited by 34 publications

(48 citation statements)

References 51 publications

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“…In addition, Jones et al (2013) demonstrate that the longitudinally varying ionosphere can, through ion drag interactions involving the DW1 (migrating or Sun-synchronous) wind field excited in situ in the thermosphere, produce significant D0 and DW2 tidal components during nonsolar-minimum conditions. The in situ generation of these waves was in fact suggested by Oberheide et al (2011b) based on CHAMP accelerometer measurements, and observational evidence for an in situ driven D0 is provided by Lieberman et al (2013). Jones et al (2013) have shown that additional diurnal and semidiurnal tidal components are generated with this mechanism and with greater efficiency for higher levels of solar activity.…”

Section: Introductionmentioning

confidence: 92%

New perspectives on thermosphere tides: 2. Penetration to the upper thermosphere

2014

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In this paper, we present new multi-year and 72-day mean seasonal-latitudinal tidal structures in exospheric temperature derived from joint analysis of CHAMP and GRACE accelerometer measurements. These results include diurnal tides DE3, DE2, D0, and DW2 and semidiurnal tides S0, SE1, SE2, SE3, SW4, and SW6. We also employ Hough mode extensions (HMEs) and the Climatological Model of Thermosphere Tides (CTMT) to ascertain whether the observed structures are consistent with those observed at 110 km and presented in part 1 of this study. The aggregate sum of all the tidal components is shown to impose considerable longitude and month-to-month variability on the exosphere temperature tidal spectrum. Please see related article: http://www.earth-planets-space.com/content/66/1/136.

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Section: Introductionmentioning

confidence: 92%

New perspectives on thermosphere tides: 2. Penetration to the upper thermosphere

2014

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“…This leads to tidal amplitudes in the MLT that can be on the order of the background mean flow, and the overall dynamics of the MLT are thus considerably impacted by solar driven atmospheric tides. Furthermore, during solar minimum conditions when tidal dissipation is weak, the DE3 can propagate into the upper thermosphere, introducing longitudinal variability into thermospheric density and neutral winds Häusler and Lühr, 2009;Liu et al, 2009;Oberheide et al, 2009;Lieberman et al, 2013]. In particular, the eastward propagating nonmigrating diurnal tide with zonal wave number 3 (DE3) is recognized as having a significant influence on generating a wave number 4 longitudinal structure in the ionosphere and thermosphere, when viewed from a fixed local time perspective [e.g., England, 2012, and references therein].…”

Section: Introductionmentioning

confidence: 99%

Short‐term nonmigrating tide variability in the mesosphere, thermosphere, and ionosphere

et al. 2016

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The intraseasonal variability of the eastward propagating nonmigrating diurnal tide with zonal wave number 3 (DE3) during 2007 in the mesosphere, ionosphere, and thermosphere is investigated using a whole atmosphere model reanalysis and satellite observations. The atmospheric reanalysis is based on implementation of data assimilation in the Whole Atmosphere Community Climate Model (WACCM) using the Data Assimilation Research Testbed (DART) ensemble Kalman filter. The tidal variability in the WACCM+DART reanalysis is compared to the observed variability in the mesosphere and lower thermosphere (MLT) based on the Thermosphere Ionosphere Mesosphere Energetics Dynamics satellite Sounding of the Atmosphere using Broadband Emission Radiometry (TIMED/SABER) observations, in the ionosphere based on Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) observations, and in the upper thermosphere (∼475 km) based on Gravity Recovery and Climate Experiment (GRACE) neutral density observations. To obtain the short‐term DE3 variability in the MLT and upper thermosphere, we apply the method of tidal deconvolution to the TIMED/SABER observations and consider the difference in the ascending and descending longitudinal wave number 4 structure in the GRACE observations. The results reveal that tidal amplitude changes of 5–10 K regularly occur on short timescales (∼10–20 days) in the MLT. Similar variability occurs in the WACCM+DART reanalysis and TIMED/SABER observations, demonstrating that the short‐term variability can be captured in whole atmosphere models that employ data assimilation and in observations by the technique of tidal deconvolution. The impact of the short‐term DE3 variability in the MLT on the ionosphere and thermosphere is also clearly evident in the COSMIC and GRACE observations. Analysis of the troposphere forcing in WACCM+DART and simulations of the Global Scale Wave Model (GSWM) show that the short‐term DE3 variability in the MLT is not related to a single source; rather, it is due to a combination of changes in troposphere forcing, zonal mean atmosphere, and wave‐wave interactions.

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“…As reported in recent studies, the longitudinal variations of Sq have their origin at least partly from an influence of non-migrating tides (e.g., Lieberman et al 2013). Further, the ionospheric gyrofrequencies are proportional to the background magnetic field B, so the ionospheric conductivities decrease with increasing B (e.g., Richmond 1995, Stening andWinch 2013).…”

Section: Sq Foci Tracks For Dataset 2 (2011)mentioning

confidence: 79%

Does the South Atlantic Anomaly influence the ionospheric Sq current system? Inferences from analysis of ground-based magnetic data

Koch

Kuvshinov

2015

Earth, Planets and Space

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We study if and how the South Atlantic Anomaly influences the ionospheric solar quiet (Sq) current system. Geomagnetically quiet days are processed for the years 1990 and 2011, and the Sq foci tracks are analyzed. The two datasets allow to investigate the influence of the observatory network and the solar activity on the Sq source determination. The computed tracks result in pronounced bands in the northern and southern hemisphere, which seem to neither follow the geographic nor the geomagnetic or dip equator. Remarkably, we observe a distinct scattering of the tracks over the South Atlantic Anomaly. This systematic scattering is due to a larger shift of the southern hemisphere focus northwards during the northern summer solstice and southwards during the southern summer solstice. The physical mechanism of this systematic effect remains unclear. The longitudinal variations of the Sq foci are believed to have their origin from an influence of non-migrating tides as reported in recent studies and the anomalous weak amplitude of the geomagnetic main field over the South Atlantic Anomaly.

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Nonmigrating diurnal tides observed in global thermospheric winds

Cited by 34 publications

References 51 publications

New perspectives on thermosphere tides: 2. Penetration to the upper thermosphere

New perspectives on thermosphere tides: 2. Penetration to the upper thermosphere

Short‐term nonmigrating tide variability in the mesosphere, thermosphere, and ionosphere

Does the South Atlantic Anomaly influence the ionospheric Sq current system? Inferences from analysis of ground-based magnetic data

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