Rocket-borne and groundbased observations of coincident field-aligned currents,electron beams,and plasma density enhancements in the afternoon auroral oval |
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| Authors: | F Primdahl A Bahnsen M Ejiri P Høeg G Marklund BN Mæehlum JK Olesen E Ungstrup LJ Zanetti |
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| Institution: | 1. Danish Space Research Institute, Lundtoftevej 7, DK-2800 Lyngby, Denmark;2. National Institute of Polar Research, 9-10 KAGA, 1-CHOME, Itabashi-ku, Tokyo, Japan;3. Max-Planck-Institut für Aeronomie, D-3411 Katlenburg-Lindau 3, BRD;4. Electron and Plasma Physics, Royal Institute of Technology, S-10 044 Stockholm, Sweden;5. Division of Geophysics, Danish Meteorological Institute, Lyngbyvej 100, DK-2100 Copenhagen, Denmark;7. Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD 20707, U.S.A. |
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| Abstract: | Results are reported from a rocket experiment conducted at Søndre Strømfjord, Greenland, on 22 August 1976, at 16.00 M.L.T. A series of plasma, particles, and fields and wave experiments were carried on board the payload, and the venture was supported by data from the AE-C satellite and by groundbased ionosondes and magnetometers at the launch site and at Godhavn. Two regions of field-aligned electron precipitation, electron density and temperature enhancements, and field-aligned upflowing current sheets were intercepted by the rocket. The density enhancements were also observed by groundbased ionosondes. Significant discrepancies were found between the currents carried by the streaming electrons in the 0.15–10 keV range and the upflowing currents seen by the on board magnetometer, suggesting that the upflowing current could not be the primary driver of the electron acceleration mechanism. The E-region was unstable to the combined Gradient-Drift and Farley-Buneman instability, and plasma turbulence was observed in situ, but the absolute density fluctuations were too small to return detectable HF-radar power to the ground. |
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