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Positive/Negative Effects of Solar Wind Density on Auroral Electrojets

Positive/Negative Effects of Solar Wind Density on Auroral Electrojets. RU (RL) is the rate of change of the AU (AL) index per unit solar wind density. The rates are small for northward IMF. As the southward IMF becomes larger, the distribution bifurcates.

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Positive/Negative Effects of Solar Wind Density on Auroral Electrojets

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  1. Positive/Negative Effects of Solar Wind Density on Auroral Electrojets • RU (RL) is the rate of change of the AU (AL) index per unit solar wind density. • The rates are small for northward IMF. As the southward IMF becomes larger, the distribution bifurcates. • These results indicate that the enhanced solar wind density not only can increase (blue pluses) but also can decrease (red pluses) the auroral electrojets.

  2. An Example of Negative Effects • The absolute values of the AU and AL indices change negatively with the solar wind density in Interval I (red curves). • For interpretation, we suggest that a compression may stretch the magnetotail [Wing and Sibeck, 1997] and counteract the dipolarization process of a substorm, reducing the energy release into the ionosphere.

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