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| Titel |
Nonmigrating tidal signatures in the magnitude and the inter-hemispheric asymmetry of the equatorial ionization anomaly |
| VerfasserIn |
C. Xiong, H. Lühr |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 6 ; Nr. 31, no. 6 (2013-06-27), S.1115-1130 |
| Datensatznummer |
250019056
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1115-2013.pdf |
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| Zusammenfassung |
| Based on nine years of observations from the satellites CHAMP and GRACE the
tidal signatures in the magnitude and the inter-hemisphere asymmetry of the
equatorial ionization anomaly (EIA) have been investigated in this study.
The EIA magnitude parameters show longitudinal wavenumber 4 and 3 (WN4/WN3)
patterns during the months around August and December, respectively, while
for different EIA parameters the contributions of the various tidal
parameters are different. For the crest-to-trough ratio (CTR) the dominating
nonmigrating tidal component contributing to WN4 is DE3 during the months
around August, while during the months around December solstice the
stationary planetary wave, SPW3, takes a comparable role to DE2 in
contributing to WN3. For the apex height index (ApexHC) of the EIA fluxtube
the stationary planetary waves, SPW4/SPW3, exceed the amplitudes of DE3/DE2
taking the leading role in causing the longitudinal WN4/WN3 patterns. During
the months around December solstice the SW3 tide is prominent in both CTR
and ApexHC. SW3 shows a strong dependence on the solar flux level, while it
is hardly dependent on magnetic activity. For the EIA inter-hemispheric
asymmetry only WN1 and WN2 longitudinal patterns can be seen. During June
solstice months the pattern can be explained by stationary planetary waves
SPW1 and SPW2. Conversely, around December solstice months longitudinal
features exhibit some local time evolution, in particular the diurnal
nonmigrating tide D0 takes the leading role. |
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