Comparison of magnetic field perturbations and solar electron profiles in the polar cap

Physics

Scientific paper

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Electron Distribution, Geomagnetism, Magnetic Disturbances, Polar Caps, Solar Electrons, Interplanetary Magnetic Fields, Lines Of Force, Magnetic Storms, Northern Hemisphere, Oscillographs, Pitch (Inclination)

Scientific paper

The paper presents a comparison of magnetic field perturbations and solar electron profiles in the polar cap. Pitch angle distributions of the solar electrons are used to infer the locations of closed geomagnetic field lines that are compared with the locations of certain features of the magnetic perturbations; an example is given that shows a peak in the postnoon cleft region perturbation occurring near the location where the solar electron pitch angle distribution changes from anisotropic to isotropic consistent with the suggestion that the peak in the cleft region perturbation occurs at or close to the dayside limit of closed field lines. Two examples are given where antisunward perturbations in the polar cap are associated with a closed field region surrounded by open field lines; this configuration may be rare and is probably associated with unusual IMF conditions present.

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