Determination of the Sharp, Longitudinal Gradients in Equatorial ExB Drift Velocities Associated with the 4-cell, Non-migrating Structures

Details Determination of the Sharp, Longitudinal Gradients in Equatorial ExB Drift Velocities Associated with the 4-cell, Non-migrating Structures Determination of the Sharp, Longitudinal Gradients in Equatorial ExB Drift Velocities Associated with the 4-cell, Non-migrating Structures

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13c..05a&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA13C-05

Physics

[2411] Ionosphere / Electric Fields, [2415] Ionosphere / Equatorial Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics

Scientific paper

Previous studies have established the existence of a 4-cell, longitude pattern in equatorial F region ionospheric parameters such as TEC and electron densities and in daytime, equatorial ExB drift velocities. A recent paper, for the first time, quantified the longitude gradients in ExB drift associated with the 4-cell tidal structures and confirmed that these sharp gradients exist on a day-to-day basis. Using the Ion Velocity Meter (IVM) on the Communication/Navigation Outage Forecast System (C/NOFS) satellite to obtain daytime, vertical ExB drift velocities, it was found, for example, that for October 5, 6 and 7, 2009 in the Atlantic sector, the ExB drift velocity gradient was about 1m/sec/degree. For March 23, 24 and 25, 2009 in the Peruvian sector, it was about -4m/sec/degree. This talk summarizes past observations of the sharp longitude gradients in vertical ExB drift velocities and the effect of these sharp gradients on theoretically-calculated ion density distributions as a function of latitude and longitude. We also present initial, ground-based magnetometer-inferred vertical ExB drift velocities from the LISN (Low-latitude Ionospheric Sensor Network) chain of magnetometers at 295 E. geographic longitude and 310 E. geographic longitude that provide the day-to-day and seasonal variability in ExB drifts at the boundary between the Peruvian longitude sector and the Atlantic longitude sector. The advantages of these continuous, daytime observations are discussed.

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