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Detailed Reference Information |
Machida, S., Mukai, T., Saito, Y., Hirahara, M., Obara, T., Nishida, A., Terasawa, T. and Maezawa, K. (1994). Plasma distribution functions in the Earth's magnetotail (XGSM~ -42RE) at the time of a magnetospheric substorm: GEOTAIL/LEP observation. Geophysical Research Letters 21: doi: 10.1029/94GL00187. issn: 0094-8276. |
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Three plasma burst events were observed with the Low Energy Particle (LEP) instrument onboard GEOTAIL at XGSM=-42RE. Two of these events were detected when the spacecraft was in the plasma sheet. In these events, the first signature of the burst was the tailward flow of the accelerated electrons with energies of about 5 keV. This was followed by the appearance of the tailward streaming ions with energies >20 keV. Importantly, these tailward streaming ions were observed together with the nonstreaming ions of the plasma sheet which had not experienced acceleration or heating. Then the electron distribution function started to develop an elongated core component at 1 keV. These two events lasted for about two minutes. The spacecraft was in the tail lobe before the third event took place. In this event the first signature was the bistreaming electrons with peak energy at 2 keV. After a short interval of the flux decrease, hot electrons with energy ~3 keV appeared. The velocity distribution function of the ions had an incomplete shell structure with an average tailward velocity of ~900 km/sec. The non-streaming component was absent in this case. It is suggested that in the first two events the spacecraft was in the plasma jet emanating from the near Earth neutral line, while it traversed the edge of the plasmoid in the third event. The associated substorm onset can be identified for the first event after which the disturbance continued. ¿ American Geophysical Union 1994 |
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Abstract |
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Keywords
Magnetospheric Physics, Magnetospheric configuration and dynamics, Magnetospheric Physics, Magnetotail, Magnetospheric Physics, Storms and substorms |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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