Energetic particle activity at 5-min and 10-s time resolution in the magnetotail and its relation to auroral activity

Physics

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Auroras, Energetic Particles, Geomagnetic Tail, Radiation Counters, Sudden Ionospheric Disturbances, Bursts, Electrons, Experiment Design, Explorer 47 Satellite, Explorer 50 Satellite, Geomagnetism, Protons

Scientific paper

The paper examines several energetic particle bursts associated with substorm events in the magnetotail using data from the Imp 7 and 8 spacecraft experiments. Individual proton and electron bursts observed by the spacecraft do not always coincide nor does magnetotail activity correlate strongly with auroral activity on time scales less than 1 hr. The pitch angle distributions were determined with a time resolution of 10 s by combining magnetic field and particle measurements on Imp 8; during intense particle bursts the 0.3-MeV protons exhibit unidirectional or bidirectional anisotropies along the magnetic field. The data suggest the presence of small localized acceleration regions in the magnetotail observable when magnetically connected to the spacecraft; little evidence is found for a single neutral line extending across the width of the magnetotail.

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