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

Forbes, Jeffrey M.; Zhang, Xiaoli; Bruinsma, Sean

doi:10.1186/1880-5981-66-122

Cited by 32 publications

(41 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This tidal mode has a stronger zonal component and a weaker meridional component. Among upward propagating tidal modes, DE3 has a larger vertical wavelength allowing it to penetrate deep into the ionosphere (Forbes et al, ; Hagan et al, ). DE3 controls the electrodynamics of the equatorial E region during the months when it is stronger (e.g., He et al, ; Wan et al, ).…”

Section: Resultsmentioning

confidence: 99%

Evidence for the Influence of DE3 Tide on the Occurrence of Equatorial Counterelectrojet

Singh

Gurubaran

2018

Geophysical Research Letters

View full text Add to dashboard Cite

The long‐term Challenging Minisatellite Payload magnetometer data are analyzed to derive the equatorial counterelectrojet (CEJ) signatures globally over a range of local times. The resultant local time‐longitude map of CEJ occurrence rate shows a strong influence of the diurnal eastward propagating wave number 3 (DE3) nonmigrating tide during July–September months. DE3 is also shown to account for the reduction of CEJ occurrence at certain longitudes. These aspects of DE3 tide‐CEJ relationship have implications for understanding the seasonal and longitudinal variations of CEJ. Observations of zonal winds from the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) Doppler Interferometer instrument on board the TIMED satellite are used to establish these findings.

show abstract

Section: Resultsmentioning

confidence: 99%

Evidence for the Influence of DE3 Tide on the Occurrence of Equatorial Counterelectrojet

Singh

Gurubaran

2018

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Chang et al () demonstrated the generation of the westward propagating semidiurnal tide with k = 1 due to the nonlinear interaction. The origin of various nonmigrating tidal components due mostly to nonlinear interactions was discussed by Truskowski et al () and Forbes et al ().…”

Section: Discussionmentioning

confidence: 99%

Variabilities of Low‐Latitude Migrating and Nonmigrating Tides in GPS‐TEC and TIMED‐SABER Temperature During the Sudden Stratospheric Warming Event of 2013

Sridharan

2017

JGR Space Physics

View full text Add to dashboard Cite

The Global Positioning System deduced total electron content (TEC) data at 15°N (geomagnetic), which is the crest region of equatorial ionization anomaly, are used to study tidal variabilities during the 2013 sudden stratospheric warming (SSW) event. The results from space‐time spectral analysis reveal that the amplitudes of migrating diurnal (DW1) and semidiurnal (SW2) tides are larger than those of nonmigrating tides. After the SSW onset, the amplitudes of DW1, SW2, SW1, and DS0 increase. Moreover, they show 16 day variations similar to the periodicity of the high‐latitude stratospheric planetary wave (PW), suggesting that the nonmigrating tides (SW1 and DS0) are possibly generated due to nonlinear interaction of migrating tides with PW. Similar spectral analysis on temperature at 10°N obtained from the Sounding of Atmosphere by Broadband Emission Radiometry (SABER) shows that the SW2 enhances at stratospheric heights and the SW2 is more dominant at 80–90 km, but its amplitude decreases around 100 km. The amplitudes of nonmigrating tides become comparable to those of SW2 around 100 km, and their contribution becomes increasingly important at higher heights. This suggests that the nonlinear interaction between migrating tides and PW occurs at low‐latitude upper mesospheric heights, as SW2 exhibits 16 day periodicity in SABER temperature at 100 km as observed in TEC. Besides, it is observed that the eastward propagating tides are less dominant than westward propagating tides in both TEC and SABER temperatures.

show abstract

“…Earlier, Oberheide et al () revealed that SE2 and SPW4 could also form wavenumber 4 signatures. Truskowski et al () Forbes et al () noted that along with DW1, the nonmigrating tides DE3, DE2, DW2 were having strong signatures of upward propagation from lower atmospheric sources. The presence of strong tropical easterly jet during summer and fall equinox over South Asian region could not influence tidal propagation, as the tidal phase speeds are very larger than the jet velocity.…”

Section: Discussionmentioning

confidence: 99%

Seasonal Variations of Low‐Latitude Migrating and Nonmigrating Diurnal and Semidiurnal Tides in TIMED‐SABER Temperature and Their Relationship With Source Variations

Sridharan

2019

JGR Space Physics

View full text Add to dashboard Cite

Seasonal and source variations of migrating and nonmigrating tides are studied using Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics‐Sounding of the Atmosphere using Broadband Emission Radiometry temperature data at 10°N (5–15°N) for the year 2009. The migrating DW1 shows equinoctial maximum and summer minimum at low latitudes. It shows equinoctial asymmetry with larger amplitudes during spring equinox than fall equinox. The migrating semidiurnal tidal amplitude (SW2) shows larger amplitudes (~20 K) during March–October at 30–60°S. Its seasonal variation resembles stratospheric (10 hPa) ozone variations at southern midlatitudes. During the sudden stratospheric warming of 2009, the SW1 shows larger amplitudes over the equator and it is generated due to nonlinear interaction between SW2 and planetary wave of zonal wave number 1. The eastward nonmigrating DE4 and DE3 tides enhance in summer. The DE3 and DE4 appear to be generated due to latent heat release in the troposphere, as their amplitudes in the National Center for Environmental Prediction (NCEP)'s Precipitable water vapor (proxy for latent heat release) enhance at similar times as in mesosphere. The DW2 and DW0 tides are likely to be generated due to nonlinear interaction between DW1 and planetary wave of zonal wave number 1. The SW3 enhancement during the early winter (November‐December) may be due to nonlinear interaction between DW1 and the large‐amplitude DW2. The nonlinear interactions of DW1 with planetary wave and nonmigrating tides explain the summer minimum and equinoctial asymmetry of DW1.

show abstract

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

Cited by 32 publications

References 14 publications

Evidence for the Influence of DE3 Tide on the Occurrence of Equatorial Counterelectrojet

Evidence for the Influence of DE3 Tide on the Occurrence of Equatorial Counterelectrojet

Variabilities of Low‐Latitude Migrating and Nonmigrating Tides in GPS‐TEC and TIMED‐SABER Temperature During the Sudden Stratospheric Warming Event of 2013

Seasonal Variations of Low‐Latitude Migrating and Nonmigrating Diurnal and Semidiurnal Tides in TIMED‐SABER Temperature and Their Relationship With Source Variations

Contact Info

Product

Resources

About