Plasmoid formation for multiple onset substorms: Observations of the Japanese Lunar Mission "kaguya"

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Abstract

The Japanese Lunar Mission "Kaguya" carried out its first magnetic field and plasma measurements in the Earth's magnetotail on 22 December 2007. Fortuitously, three well-defined multiple onset substoms took place. Kaguya was located in the premidnight magnetotail at radial distances of 56REand observed plasmoids and/or traveling compression regions (TCRs). Although the present study is based on limited data sets, important issues on multiple onset substorms can be examined. Each onset in a series of onsets releases a plasmoid, and magnetic reconnection likely proceeds to tail lobe field lines for each onset. Since the duration of each plasmoid is less than 5 min, these observations imply that magnetic reconnection for each onset can develop fully to the tail lobe field lines and be quenched within this timescale.

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Nagai, T., Tsunakawa, H., Shibuya, H., Takahashi, F., Shimizu, H., Matsushima, M., … Amm, O. (2009). Plasmoid formation for multiple onset substorms: Observations of the Japanese Lunar Mission “kaguya.” Annales Geophysicae, 27(1), 59–64. https://doi.org/10.5194/angeo-27-59-2009

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