Nonmigrating tidal signals in the upper thermospheric zonal wind at equatorial latitudes as observed by CHAMP

By K. Häusler, Hermann Lühr. 2009

137 citations recorded by the source corpus.

Abstract. The accelerometer onboard CHAMP enables us to derive the thermospheric zonal wind at orbit altitudes (~400 km). Numerous equatorial overflights (~45 250) are used to investigate the influence of nonmigrating tides on the thermospheric zonal wind. In a previous study a so called "wave-4" longitudinally signal observed in the satellite frame was identified in the zonal wind residuals during equinox. Using four years of data (2002–2005), we determine the annual variation of this prominent feature which is strongest during the months of July through October and has a smaller second maximum during March/April. Due to the large data set we were able to separate the observed wavenumbers into the tidal components. Thereby, we can identify the eastward propagating diurnal tide with zonal wavenumber s =3 (DE3) as the prime cause for the observed wave-4 pattern in the zonal wind. Analyzing the zonal wind along the geographic and the dip equator revealed that the largest amplitudes of DE3 are found along the dip equator. Besides DE3 we present the full spectrum of nonmigrating tides in the upper thermosphere.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/c79533eb024f456fb9c6b6c1a118162cd8f50563

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In Astronomy and Astrophysics

1. J. Oberheide
2. Sean Bruinsma
3. Jeff Forbes
4. H. Liu
5. K. Häusler
6. Qian Wu
7. R. Akmaev
8. Eelco Doornbos

In Oceanography

1. H. Liu
2. Jeff Forbes
3. J. Oberheide
4. Sean Bruinsma
5. Eelco Doornbos
6. J. Emmert

Citations in the corpus

• Tropospheric tides from 80 to 400 km: Propagation, interannual variability, and solar cycle effects (2009, background): “In the upper thermosphere, the DE3 tide has been found in thermospheric neutral winds [Häusler et al., 2007; Häusler and Lühr, 2009] and temperatures [Forbes et al., 2009] based on in situ accelerometer measurements on the Challenging Minisatellite Payload (CHAMP) and Gravity Recovery And…”
• Variability and predictability of the space environment as related to lower atmosphere forcing (2016, background): “Observations have shown that tidal signals can extend into the upper thermosphere, including the ionospheric dynamo region [e.g., Häusler et al., 2007; Häusler and Lühr, 2009; Forbes et al., 2008, 2009; Oberheide et al., 2009; Häusler et al., 2010], in spite of the strong molecular damping of the wa”