Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa14a..07c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA14A-07
Other
[2415] Ionosphere / Equatorial Ionosphere, [2439] Ionosphere / Ionospheric Irregularities, [2471] Ionosphere / Plasma Waves And Instabilities, [6934] Radio Science / Ionospheric Propagation
Scientific paper
In this study, the global patterns of ionospheric scintillations observed by the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) satellites over a 4-year period are analysed. A clear advantage of employing the space-borne COSMIC Radio Occultation (RO) measurements, as opposed to using ground-based instruments, is that the resulting dataset covers the majority of the globe over an extended period of time, irrespective of geographical constraints (e.g. land/sea coverage). The majority of the scintillations that are associated with upwelling plasma bubbles in the lower-F-region (150-400 km altitude) are observed between dusk and midnight at locations close to the magnetic equator with a strong seasonal dependence, as expected. It is shown that the scintillations observed between 2007 and 2010 are generally weakest around the June solstice and are strongest close to the March equinox. As the COSMIC RO dataset used in this study covered the entire globe over the 4-year period, the scintillations associated with plasma bubbles in each of the American, African, Asian and Pacific longitudinal sectors are investigated and compared. Asymmetries between the solstices and equinoxes in certain longitudinal sectors that have previously been identified in studies using ground-based instruments are also investigated. It is shown that ionospheric scintillations in the American (Asian) sector are stronger (weaker) than those observed in the other longitudinal sectors, irrespective of season. Finally, the effects of increased geomagnetic activity on the statistical scintillation patterns are also explored and discussed in the context of ionospheric scintillation event prediction.
Carter Brian A.
Norman Rick
Zhang Kaicheng
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