Comparison of the two-snake model with the observed polarization of the substorm-associated magnetic pulsation Ps6.

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Abstract
The damped-type long-period (T=10-20min) magnetic variation associating with a substorm is called the Ps6-type Pi3 pulsation, or briefly Ps6. The two-snake model including meandering ionospheric currents during a substorm which has been proposed in previous papers to explain the morphological characteristics of Ps6 is examined in the present paper to interpret the observed polarization of the ground-based Ps6. A model calculation suggests that from the viewpoint of the polarization the area near a snake-type model electrojet is expected to be divided into five domains: pole-side pre-midnight domain (right-handed), pole-side post-midnight domain (L), central domain (R & L), equator-side pre-midnight domain (L), and equator-side post-midnight domain (R). This theoretically expected polarization rule is examined by two ways: statistical study and case study of the observed Ps6. The polarization of 214 Ps6 events observed at Point Barrow and College is statistically found to be governed by the theoretical polarization rule. A case study on Ps6 waves sorted out through a digital filter from five substorm events corresponding to the five domains indicates that the polarization rule obtained observationally in this way also agrees with the theoretical polarization rule.

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