 |
| Titel |
Tidal signatures of the thermospheric mass density and zonal wind at midlatitude: CHAMP and GRACE observations |
| VerfasserIn |
C. Xiong, Y.-L. Zhou, H. Lühr, S.-Y. Ma |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 33, no. 2 ; Nr. 33, no. 2 (2015-02-04), S.185-196 |
| Datensatznummer |
250121161
|
| Publikation (Nr.) |
 copernicus.org/angeo-33-185-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| By using the accelerometer measurements from CHAMP and GRACE satellites, the
tidal signatures of the thermospheric mass density and zonal wind at
midlatitudes have been analyzed in this study. The results show that the mass
density and zonal wind at southern midlatitudes are dominated by a
longitudinal wave-1 pattern. The most prominent tidal components in mass
density and zonal wind are the diurnal tides D0 and DW2 and the semidiurnal
tides SW1 and SW3. This is consistent with the tidal signatures in the
F region electron density at midlatitudes as reported by Xiong
and Lühr (2014).
These same tidal components are observed both in the thermospheric and
ionospheric quantities, supporting a mechanism that the non-migrating tides
in the upper atmosphere are excited in situ by ion–neutral interactions at
midlatitudes, consistent with the modeling results of Jones Jr. et al. (2013). We
regard the thermospheric dynamics as the main driver for the electron density
tidal structures. An example is the in-phase variation of D0 between electron
density and mass density in both hemispheres. Further research including
coupled atmospheric models is probably needed for explaining the similarities
and differences between thermospheric and ionospheric tidal signals at
midlatitudes. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|