Statistics – Computation
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm51a1343y&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM51A-1343
Statistics
Computation
[0545] Computational Geophysics / Modeling, [1956] Informatics / Numerical Algorithms, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems
Scientific paper
We propose an inclusive techunique for analyzing MI-coupled current system using Whalen-relation for non-linear and quasi-steady Alfvenic disturbance and Hall conjugate current (HCC) analysis. By applying Whalen-relation to the Alfvenic disturbance near the ionosphere, arbitrary incompressible MHD fields of (b,v) can be separated into the incident part to the ionosphere and reflected part from the ionosphere. Separated incident field from (b,v) gives electromotive force (emf) for generation of ionospheric current system. This “emf” is propagating from the magnetosphere with the incident field-aligned current accompanied by the incident Alfvenic disturbances. Reflected fields are generated to cancel out the divergent part of ionospheric current produced by this “emf” from the magnetosphere. Thus, this formulation is very useful for describing and analyzing of MI-coupling process from viewpoint of “cause and effect”. This formulation clarify that induced charge in the ionosphere and their associated reflected electric field is composed by the direct reflection part for incident field and polarization part generated to cancel out the divergence part of ionospheric current caused by coupling of incident field to the gradient of ionospheric conductivities. Cleary, both divergent part of primary Pedersen and primary Hall current possibly become source of polarization field and their associated secondary ionospheric current system including reflected FAC. Therefore, we can expect to separate the MI-coupled current system into two orthogonal current system, the first is originating divergence of primary Pedersen current and the second is originating divergence of primary Hall current. We call the former current system as α-current channel and the latter current system as β-current channel. The α-current channel is directly coupled to the magnetospheric source region, which supplies “emf” of ionospheric current system. A feed back Hall effect from the β-current channel causes Cowling effect in the α-current channel. A dynamo of β-current channel is polarization field generated by the Hall current divergence, and this current channel act as generator of feed back FAC to the magnetosphere. Using Hall Conjugate Current Analysis (HCC) developed by Yoshikawa (2009), unique separation of MI-coupled current system into α-current channel and β-current channel can be achieved under any ionospheric conductivity conditions. Thus, combination of the Whalen-separation of Alfvenic disturbance and the HCC is very useful for surveying of MI-coupling process from viewpoint of cause and effect between magnetospherc dynamics and ionospheric response.
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