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| Titel |
Comparing daytime, equatorial E×B drift velocities and TOPEX/TEC observations associated with the 4-cell, non-migrating tidal structure |
| VerfasserIn |
D. Anderson, E. Araujo-Pradere, L. Scherliess |
| 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 ; 27, no. 7 ; Nr. 27, no. 7 (2009-07-20), S.2861-2867 |
| Datensatznummer |
250016595
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2861-2009.pdf |
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| Zusammenfassung |
| We investigate the seasonal and longitude dependence of the daytime,
vertical E×B drift velocities, on a day-to-day basis, using a
recently-developed technique for inferring realistic E×B drifts from
ground-based magnetometer observations. We have chosen only quiet days, Ap<10,
from January 2001 through December 2002, so that the main
contribution to the variability is due to the variability in the tidal
forcing from below. In order to study the longitude dependence in daytime
E×B drift velocities, we use appropriately-placed magnetometers in the
Peruvian, Philippine, Indonesian and Indian longitude sectors. Since we are
particularly interested in quantifying the E×B drift velocities associated
with the 4-cell, non-migrating tidal structure, we compare the seasonal and
longitude E×B drift structure with TOPEX satellite observations of Total
Electron Content (TEC). We outline a plan to establish the magnitude of the
longitude gradients that exist in the daytime, vertical E×B drift velocities
at the boundaries of the observed 4-cell patterns and to theoretically
identify the physical mechanisms that account for these sharp gradients. The
paper demonstrates that sharp gradients in E×B drift velocities exist at one
of the 4-cell boundaries and outlines how the C/NOFS IVM and VEFI sensor
observations could be used to establish the E×B drift longitude gradients at
the boundaries of each of the 4 cells. In addition, the paper identifies one
of the theoretical, atmosphere/ionosphere models that could be employed to
identify the physical mechanisms that might explain these observations. |
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