Abstract

In a study that tests the hypothesis that magnetosheath magnetic fields are disturbed on plasma streamlines which are connected to the quasi‐parallel bow shock, magnetometer observations from the ISEE 2 and IMP 8 spacecraft are used to investigate the dayside spatial distributions of fluctuating magnetosheath fields for different interplanetary field orientations. The results suggest that although other sources such as Kelvin‐Helmholtz instabilities and flux transfer processes probably contribute to the fluctuations in the magnetosheath field, the quasi‐parallel shock source is an important contributor in the dayside region.

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