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- W1977467312 abstract "Data from the auroral particles experiment on Ogo 4 were used to study effects of interplanetary magnetic-field latitude and dipole tilt angle on high-latitude precipitation of low-energy electrons. It was found that: (1) The low-latitude boundary of polar-cusp electron precipitation at 0900 to 1500 MLT moves equatorward by several degrees during substorms and, in the absence of significant substorm activity, after a period of southward interplanetary magnetic field. This behavior is interpreted to result from erosion of dayside magnetic flux into the tail and to be a part of the substorm growth phase. Comparisons of southward solar-wind magnetic flux and the eroded magnetic flux indicate a merging efficiency of 5 to 30%. Expected cross-tail electric potentials lie in the range 36 to 84 kv, in reasonable agreement with observation. (2) With times containing substorm activity or a southward interplanetary magnetic field eliminated, the low-latitude boundary of polar-cusp electron precipitation is found to move by approximately 4° over the total yearly range of tilt angles. At maximum winter and summer conditions, the invariant latitude of the boundary is shown to shift by approximately −3° and +1°, respectively, from its equinox location. This same asymmetry is found in calculations of the invariant latitude of the first open field line in the Mead-Fairfield model magnetosphere. The observed polar-cusp lower boundaries lie approximately 3° below the calculated first open field lines and coincide with the average >35-kev electron boundaries of Feldstein and Starkov." @default.
- W1977467312 created "2016-06-24" @default.
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- W1977467312 date "1972-12-01" @default.
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- W1977467312 title "Precipitation of low-energy electrons at high latitudes: Effects of interplanetary magnetic field and dipole tilt angle" @default.
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- W1977467312 doi "https://doi.org/10.1029/ja077i034p06696" @default.
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