The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars

Malinga, Sandile B.; Ruohoniemi, J. M.

doi:10.5194/angeo-25-1767-2007

Cited by 23 publications

(32 citation statements)

References 33 publications

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“…For larger periods, smaller amplitudes dominate. Furthermore, we find a clear maximum at 47-48 h and two secondary maxima at 42-43 h and 50-51 h. The latter two maxima are not statistically significant but, together with the primary maximum, they correspond to the three maxima presented by Malinga and Ruohoniemi (2007).…”

Section: Resultsmentioning

confidence: 60%

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Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Lilienthal

Jacobi

2015

Atmos. Chem. Phys.

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Abstract. The quasi 2-day wave (QTDW) at 82-97 km altitude over Collm (51 • N, 13 • E) has been observed using a VHF meteor radar. The long-term mean amplitudes calculated using data between September 2004 and August 2014 show a strong summer maximum and a much weaker winter maximum. In summer, the meridional amplitude is slightly larger than the zonal one with about 15 m s −1 at 91 km height. Phase differences are slightly greater than 90 • on an average. The periods of the summer QTDW vary between 43 and 52 h during strong bursts, while in winter the periods tend to be more diffuse. On average, the summer QTDW is amplified after a maximum of zonal wind shear which is connected with the summer mesospheric jet and there is a possible correlation of the summer mean amplitudes with the background wind shear. QTDW amplitudes exhibit considerable inter-annual variability; however, a relationship between the 11-year solar cycle and the QTDW is not found.

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Section: Resultsmentioning

confidence: 60%

“…Lilienthal and Ch. Jacobi: Meteor radar quasi 2-day wave observations over 10 years, Collm by Malinga and Ruohoniemi (2007); see also Pancheva et al (2004) and Tunbridge et al (2011). The dominating one has periods of approximately 48 h with wave numbers 2 and 3.…”

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confidence: 99%

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Lilienthal

Jacobi

2015

Atmos. Chem. Phys.

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“…The concept of QTDW "lifetime" has been previously researched (Craig et al, 1980;Fritts et al, 1999;Pancheva et al, 2004;Malinga and Ruohoniemi, 2007). In a southern summer, the QTDW usually has one burst and last about 5 UARS/HRDI observations to show their impact on shortterm variations of these parameters.…”

Section: Short-term Variationsmentioning

confidence: 99%

“…In the northern summer, they perform series of burst events separated for 5-8 days (Riggin et al, 2004;Dutta et al, 2012). Their peak amplitudes often occur at 70 km (Malinga and Ruohoniemi, 2007), and they also exist in the lower atmosphere at low latitude (Dutta et al, 2012). Vertical wavelengths of them range from 40 to 110 km (Pancheva et al, 2004).…”

Section: Y Y Huang Et Al: Global Climatological Variability Of Quamentioning

confidence: 99%

“…Vertical wavelengths of them range from 40 to 110 km (Pancheva et al, 2004). In the Southern Hemisphere (SH), their periods and wavenumbers are about 48 h and −3 (minus means westward propagation), respectively, while in the Northern Hemisphere (NH), periods contain 53-56, 48-50 and 42-43 h, with corresponding wavenumbers −2, −3 and −4 (Craig et al, 1980;Pancheva et al, 2004;Malinga and Ruohoniemi, 2007). Moreover, numerous observations have verified the nonlinear interactions between QTDWs and other PWs (Pancheva et al, 2004;Babu et al, 2011;Li and Ning, 2011), which can partly explain the short-term variations of QTDWs.…”

Section: Y Y Huang Et Al: Global Climatological Variability Of Quamentioning

confidence: 99%

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Global climatological variability of quasi-two-day waves revealed by TIMED/SABER observations

et al. 2013

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This paper presents characteristics of quasi-two-day waves (QTDWs) in the mesosphere and lower thermosphere (MLT) between 52° S and 52° N from 2002 to 2011 using TIMED/SABER temperature data. Spectral analysis suggests that dominant QTDW components at mid-high latitudes of the Southern Hemisphere (SH) and the Northern Hemisphere (NH) are (2.13, W3) and (2.04, W4), respectively. The most remarkable QTDW is (2.13, W3), which happened in the southern summer of 2002–2003 at 32° S from 60 to 90 km in altitude. Its downward phase propagation indicates upward propagation of the wave energy and a potential source region below 60 km. Analysis of horizontal wind fields in the same period shows the westward and southward propagation of (2.13, W3) and a possible reflection region above 90 km. Fundamental parameters of QTDWs present significant interhemispheric differences and interannual variations in statistical analysis. Amplitudes in the SH are twice larger than that in the NH, and vertical wavelengths are a little longer in the SH. QTDWs may endure stronger dissipation in southern summer because of shorter durations of their attenuation stages. Impact of the equatorial quasi-biennial-oscillation (QBO) on QTDWs can extend to mid-high latitudes of both hemispheres. It seems easier for QTDWs to propagate upward in the equatorial QBO's westerly phase in the lower stratosphere and easterly phase in the middle stratosphere. Interannual variations of QTDW strength may be influenced by solar activity as well. Strengths of QTDWs appear to be stronger (weaker) in the solar maximum (minimum)

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Quasi‐two‐day wave structure, interannual variability, and tidal interactions during the 2002–2011 decade

Moudden

Forbes

2014

JGR Atmospheres

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In this paper we employ Thermosphere Ionosphere Mesosphere Energetics Dynamics/Sounding of the Atmosphere using Broadband Emission Radiometry temperature measurements from 20 to 120 km and between about ±72° latitude to investigate several aspects of the quasi‐two‐day wave (QTDW) during the 2002–2011 decade, including interannual variability of its seasonal‐latitudinal structure, its penetration into the lower thermosphere, and various wave‐wave interactions. We focus on two components of the QTDW: the westward‐propagating component with zonal wave number s=3 (TDW3), and the eastward‐propagating component with s=−2 (TDE2). TDW3(TDE2) has maximum amplitudes during 2003, 2004, and 2011(2006 and 2011) and both waves have their lowest amplitudes during the deep solar minimum years of 2008–2009. TDW3 and to some degree TDE2 penetrate with significant amplitudes up to 120 km altitude, well into the region where neutral winds generate electric fields through the dynamo mechanism. A new “longitude subdivision method (LSM)” is presented that enhances temporal resolution of TDW3 and enables the determination of 9.6 h and 16 h waves that result from nonlinear interaction between TDW3 and/or TDE2 and diurnal migrating (DW1) and semidiurnal migrating (SW2) tides. Evidence is presented for westward‐propagating 9.6 h and 16 h waves with s=5 and s=4, respectively, and a zonally symmetric (s=0) 9.6 h wave. The s=5(s=0) wave only occurs as a result of nonlinear interaction between SW2 and TDW3(TDE2), whereas the s=4 wave can result from interaction of TDW3 with DW1 or of TDE2 with SW2. We payed special attention to possible aliasing between different waves.

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The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars

Cited by 23 publications

References 33 publications

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Global climatological variability of quasi-two-day waves revealed by TIMED/SABER observations

Quasi‐two‐day wave structure, interannual variability, and tidal interactions during the 2002–2011 decade

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