Determining the Daytime, Equatorial Ionospheric Electron Densities Associated with the Observed, 4-cell Longitude Patterns in ExB Drift Velocities

Details Determining the Daytime, Equatorial Ionospheric Electron Densities Associated with the Observed, 4-cell Longitude Patterns in ExB Drift Velocities Determining the Daytime, Equatorial Ionospheric Electron Densities Associated with the Observed, 4-cell Longitude Patterns in ExB Drift Velocities

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41c..06a&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41C-06

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics

Scientific paper

It has been established from the C/NOFS Ion Velocity Meter (IVM) observations that there exist very sharp longitude gradients in daytime, vertical ExB drift velocities that define the boundaries of the 4-cell, non-migrating, ExB drift structures. These sharp gradients exist on a day-to-day basis. For example, for October 5, 6 and 7, 2009 in the Atlantic sector, the ExB drift velocity gradient is about 1/m/sec/degree while for March 23, 24 and 25, 2009 in the Peruvian sector it is about -4m/sec/degree. This paper examines the existence of sharp gradients in the Equatorial Ionospheric Anomaly (EIA) electron densities that are associated with these sharp gradients in ExB drift velocities as observed by IVM. While sharp gradients in ionospheric parameters such as TOPEX/TEC, and CHAMP/ Ne values have been associated with the 4-cell patterns, these are quantities that have been averaged over months and years. This paper presents IVM electron density observations, on a day-to-day basis, that reflect the close connection between daytime ExB drifts and the magnitude of the EIA electron densities. The periods of observations are for October, November and March, 2009 between 1000 and 1500 LT and the altitudes of the IVM observations are between 400 and 500 km. The implications of these results, as they relate to forecasting equatorial ionospheric parameters, are discussed.

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