Hemispheric asymmetries in the longitudinal structure of the low-latitude nighttime ionosphere

Details Hemispheric asymmetries in the longitudinal structure of the low-latitude nighttime ionosphere Hemispheric asymmetries in the longitudinal structure of the low-latitude nighttime ionosphere

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa22a..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA22A-06

Other

2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics

Scientific paper

Several recent studies suggest that non-migrating diurnal tides generated by tropical weather in the troposphere influence the longitudinal morphology of the low latitude F region ionosphere; in particular, a wave number four pattern is observed in the peak densities and magnetic latitudes of the equatorial anomaly. It is suspected that this variability is driven by E region processes on the dayside. Observations made with the Low Resolution Airglow and Aurora Spectrograph (LORAAS), which flew aboard ARGOS from May 1999 to April 2002, show additional evidence of periodic variations in the densities and latitudes of the equatorial anomaly crests. In this investigation, electron density profiles are reconstructed from limb scans of OI 135.6 nm emissions to obtain maps of the NmF2 at 0230 LT. Our findings show that the longitudinal variability of the NmF2 of the northern anomaly crest matches that of other global observations, but there is a pronounced hemispheric asymmetry in the longitudinal variations observed in the southern anomaly crest. We show that this asymmetry is tied to longitudinal variations in the neutral winds at F region altitudes, which act to enhance the observed wave number four pattern. We discuss the role of the neutral winds by comparing the LORAAS results to both empirical (IRI-90) and physics-based models (SAMI3).

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