Estimating the Hall to Pedersen Conductance Ratio From Ground and Satellite Magnetic Data

Details Estimating the Hall to Pedersen Conductance Ratio From Ground and Satellite Magnetic Data Estimating the Hall to Pedersen Conductance Ratio From Ground and Satellite Magnetic Data

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa31b..02j&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA31B-02

Statistics

2407 Auroral Ionosphere (2704), 2409 Current Systems (2721)

Scientific paper

Statistical estimates for the Hall to Pedersen conductance ratio are determined as a function of the ionospheric equivalent current density. The conductance ratio is attained from magnetic satellite data using the 1D Spherical Elementary Current Systems (SECS). The ionospheric equivalent current density can either be computed from ground or satellite magnetic data. Under the required 1D assumption, these two approaches are shown to be equal, which leads to the advantage that the statistics are not restricted to areas covered by ground data. Unlike other methods, using magnetic satellite measurements to determine the conductance ratio ensures reliable data over long time sequences. The statistical study, comprising over 6000 passes between 55° and 76.5° northern magnetic latitude during 2001 and 2002, is carried out employing data from the CHAMP satellite. The data are binned according to activity and season. In agreement with earlier studies, values between one and three are typically found for the conductance ratio. In a case study, the conductance ratio attained from CHAMP data is compared with an EISCAT measurement, and good compatibility is found. The results make it possible to estimate the conductance ratio from ground magnetic data alone. Using the same data, statistics of ionospheric and field-aligned current densities as a function of magnetic latitude and MLT are included. These are binned with respect to activity, season and the IMF north- south direction. For the first time, all three current density components are simultaneously studied this way on a comparable spatial scale.

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