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Matches in SemOpenAlex for { <https://semopenalex.org/work/W2020144057> ?p ?o ?g. }

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• W2020144057 abstract "A sounding rocket was launched in the early evening into an auroral display during a 50-γ positive bay. The flight path carried the rocket over the two most northerly arcs in a band of parallel east-west oriented arcs, into a region of low activity to the north of the band, and then into a large fold northeast of the launch site. Several times during the flight, intense field-aligned electron pitch-angle distributions (i.e., peaked near 0°) were observed; these regions were found to be coincident with the northern boundary of the band of auroral precipitation. No equivalent distributions were observed between arcs to the south. Electron intensities of about 1011 (cm² sec ster kev)−1 peaked near β = 0 were observed at 0.55 kev, and electrons near this energy were conservatively estimated to carry a current of 2 × 10−4 amp/m². This electron current sheet was estimated to have a large east-west extent and a north-south thickness of 10 km, and under certain conditions would produce a transverse magnetic field of 10³ γ. Field-aligned 7.8-kev electrons were also observed in the boundary region with intensities (∼3 × 109 (cm² sec ster kev)−1), a factor of 10 larger than that observed at any other time in the flight. Energetic electron (E > 25 kev) pitch-angle distributions were found to be generally antisotropic peaked near 90°; however, at times of maximum intensities, the distributions approached isotropy. Energetic proton (E > 30 kev) intensity profiles obtained during the flight were featureless, and pitch-angle distributions were anisotropic, peaked near 90°. No correlation with electron intensities was apparent; however, the proton pitch-angle distributions gradually shifted toward isotropy on two occasions of intense electron precipitation (near the center of the arc). This minor correlation wag not considered statistically significant. Low-energy ion precipitation was below the limit of detectability, and an upper limit on the primary ion beam was set at 5 × 105 (cm² sec ster kev)−1 and the 1- to 20-kev energy range. Most characteristics of particle precipitation observed in the boundary region are shown to be consistent with a local acceleration from a parallel electric field with a potential drop greater than 7 kv." @default.
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• W2020144057 date "1972-01-01" @default.
• W2020144057 modified "2023-10-14" @default.
• W2020144057 title "Observations of magnetic-field-aligned auroral-electron precipitation" @default.
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• W2020144057 doi "https://doi.org/10.1029/ja077i001p00191" @default.
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