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| Titel |
Tidal effects on longitudinal differences in electron density at mid-latitudes |
| VerfasserIn |
Kedeng Zhang, Hui Wang, Xue Cao |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250122470
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| Publikation (Nr.) |
 EGU/EGU2016-1513.pdf |
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| Zusammenfassung |
| This study studied the migrating and non-migrating tidal effects from the troposphere on the longitudinal variation of electron density (∆Ne) at mid-latitudes. Both CHAMP and Thermosphere Ionosphere Electrodynamic General Circulation model (TIEGCM) were used for the investigation. ∆Ne at altitudes higher than 200 km were affected by upward propagating tides. The tidal effects were largest at altitudes around 300 km. Migrating tides resulted in reduced longitudinal differences in ∆Ne over North America and in the Southern Hemisphere. Non-migrating tides resulted in a wave-4 structure of ∆Ne in both hemispheres, which was weaker than migrating tidal effects. The meridional wind effects on ∆Ne were stronger than zonal wind in response to migrating tides in the Northern Hemisphere, while less in the Southern Hemisphere. The meridional wind effects on ∆Ne were larger than the zonal wind in response to non-migrating tides in both hemispheres. The non-neutral wind processes played the dominant role in regulating the longitudinal structure of ∆Ne over neutral wind under tidal conditions, while the neutral winds mainly weakened ∆Ne. It was thus important to include neutral composition disturbance field at the low boundary of the model for better reproduction of atmospheric tidal effect at mid-latitudes. |
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