An empirical field-aligned current model based on the DMSP and DE 2 satellites

Details An empirical field-aligned current model based on the DMSP and DE 2 satellites An empirical field-aligned current model based on the DMSP and DE 2 satellites

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm51a1324h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM51A-1324

Physics

[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems

Scientific paper

We have developed an empirical model of the large-scale field-aligned currents (LSFACs) based on the statistical studies using the magnetic field data obtained by the DMSP and DE 2 satellites. The raw magnetic field data of a few tens of years in total have been processed by the fitting procedures developed by Higuchi and Ohtani [JGR, 2000], yielding a large data set of LSFAC sheets in both hemispheres. On deriving the statistical patterns of LSFAC structures, we classified the observed FAC sheets for each satellite pass into the lowermost latitude sheet, the second-lowest latitude sheet, (and the third-lowest latitude sheet for three sheet events), and then averaged the boundary positions and intensity of each FAC sheet separately. By combining the separately averaged positions and intensities of FACs for given solar wind-IMF conditions, we can construct the statistical patterns of LSFACs in such a way that the sharpness of the boundaries of adjacent, different LSFAC sheets are preserved rightly as they are actually observed. The resultant LSFAC model is largely consistent with the so-called R1-R2 diagram proposed by Iijima and Potemra [JGR, 1978], although several qualitative differences are discernible. The model FACs show clear dependence on the polarity and intensity of IMF-Bz, while the gross shape of LSFACs does not change much with the polarity of IMF-By. These features are consistent with the results of the past modeling studies. One of the significant improvements from the past models is that the present model gives larger FAC intensities which can reproduce the actually observed values better. This is because the present model has adopted the separate averaging and its combination of each FAC sheet as modeling procedures.

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