Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm14a..06a&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM14A-06
Physics
2409 Current Systems (2721), 2411 Electric Fields (2712), 2415 Equatorial Ionosphere
Scientific paper
The equatorial electrojet (EEJ) is an eastward electric current, flowing in a narrow band along the dip equator in the ionospheric E-region. The EEJ current strength is the product of the dayside eastward electric field and the Cowling conductivity. Both of these are important parameters in the dynamics of the ionosphere. The EEJ has a strong magnetic signature in measurements of low-orbiting satellites. To characterize the EEJ, we use a combined data set of magnetic readings from CHAMP, Oersted and SAC-C, comprising more than 75,000 equator crossings from 1999 to 2006. First, these satellite passes across the magnetic equator are inverted individually for the peak EEJ sheet current strength. We then describe these peak currents by a statistical model. This empirical model describes the mean and variance of the peak current as a function of longitude, local time, day of the year, and F10.7. The EEJ being an extremely variable current system, we were further interested in its auto-correlation in longitude and time. Previous studies using a single satellite could not separate the spatial from the temporal variability. However, using the multi-spacecraft constellation, we can infer the auto-correlation of the EEJ as a function of the longitudinal and temporal separation of two observers.
Alken Patrick
Maus Stefan
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