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Titel |
Tidal signature of the mid-latitude ionospheric nighttime anomaly using CHAMP and GRACE observations |
VerfasserIn |
Chao Xiong, Hermann Lühr |
Konferenz |
EGU General Assembly 2014
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 16 (2014) |
Datensatznummer |
250090744
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Publikation (Nr.) |
EGU/EGU2014-5047.pdf |
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Zusammenfassung |
This paper presents a study on the tidal signatures of the mid-latitude summer nighttime
anomaly (MSNA), also known as Weddell Sea anomaly in the southern hemisphere.
The electron density observations by CHAMP and GRACE show clear MSNA
structures in both hemispheres during local summer nighttime. A linear least squares
algorithm for extracting the solar tidal components is utilized to examine the major tidal
components affecting the variation of the electron density. In the southern hemisphere,
we find a prominent eastward propagating wave-1 of electron density in the local
time frame, which could be explained by the symmetric diurnal wave (D0) and a
stationary planetary wave (SPW1) component. Conversely, in the northern hemisphere
during local summer, a prominent eastward wave-2 can be found, which could be
attributed to the diurnal eastward propagating wave (DE1) and a stationary planetary
wave (SPW2) component. We are going to offer some explanations that may be
responsible for the different appearance of the wave structures in the two hemispheres. |
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