The response of an H-mode plasma to magnetic perturbations that are resonant in the edge is evaluated using a fluid model. With two exceptions, the plasma rotation suppresses the formation of magnetic islands, holding their widths to less than a tenth of those predicted by the vacuum approximation. The two exceptions are at the foot of the pedestal, where the plasma becomes more resistive, and at the surface where the perpendicular component of the electron velocity reverses. The perturbations exert a force on the plasma so as to brake the perpendicular component of the electron rotation. In the pedestal, the corresponding Maxwell stress drives the radial electric field in such a way as to accelerate ion rotation. Despite the suppression of the islands, the perturbations give rise to particle fluxes caused by magnetic flutter, with a negligible contribution from E × B convection. In the pedestal, the fluxes are such as to reduce the density.
Hモードプラズマの周辺部で共鳴する磁気摂動に対する応答を，流体モデルを用いて評価した．2つの例外を除き，プラズマ回転は磁気島の形成を抑制し，その幅は真空近似で予測される値の10分の1未満に保たれる．その2つの例外とは，プラズマがより抵抗性になるペデスタル裾部と，電子速度の垂直成分が反転する面である．摂動はプラズマに力を及ぼし，電子回転の垂直成分を制動する．ペデスタル内では，対応するマクスウェル応力が動径電場を駆動し，イオン回転を加速する方向に作用する．島の抑制にもかかわらず，摂動は磁気フラッターによる粒子フラックスを生じさせるが，E×B対流の寄与は無視できる程度である．ペデスタル内では，そのフラックスは密度を減少させる方向に働く．