Abstract
AbstractAn important feature intimately related to substorm process is the development of dipolarization in the near‐Earth region. A common concept is that it arises from magnetic flux transported by dipolarizing flux bundles generated by magnetic reconnection in the mid‐tail region. This concept is based on assuming the validity of the frozen‐in‐field condition for dipolarizing flux bundles. The frozen‐in‐field condition of this structure is critically evaluated from observations and by theoretical consideration. It is shown that this structure cannot transport sufficient magnetic flux to the near‐Earth region that is required from observations for substorms.
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