Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 35, Issue 18, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2008GL035332
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Funding
- NASA TIMED Program [NNX07AB74G]
- National Science Foundation [ATM-0719480]
- DFG
- CAWSES [OB 299/2-2]
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In-situ plasma density measurements from the CHAMP satellite between about 350-420 km altitude are used to delineate intra-annual variations in the longitudinal structure of the F-region ionosphere. It is shown that the longitude structures during mid-day local times are dominated by the space-based longitudinal wavenumbers k(s) = 2, 4 and 3 in January, July and December, respectively. These conform to the same dominating k(s)-values characterizing solar thermal tide zonal winds in the dynamo region, namely the westward-propagating semidiurnal tide with planetary-fixed zonal wavenumber s = 4 (SW4), and the eastward-propagating diurnal tides with s =-3 (DE3) and s =-2 (DE2), respectively. DE3 is the dominating tide during the other months. The results presented indicate that nonmigrating tides other than DE3 may significantly impact the longitudinal structure of the low-latitude ionosphere during certain months.
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