Plasmoids for multiple-onset substorms observed by the Japanese lunar mission Kaguya

Details Plasmoids for multiple-onset substorms observed by the Japanese lunar mission Kaguya Plasmoids for multiple-onset substorms observed by the Japanese lunar mission Kaguya

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm24a..05t&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM24A-05

Physics

2723 Magnetic Reconnection (7526, 7835), 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet, 2790 Substorms

Scientific paper

The Japanese lunar mission Kaguya has encountered the Earth magnetotail at radial distances of approximately 60 Re. On December 22-25, 2007, observations of the magnetotail were carried out with the lunar magnetometer LMAG and the plasma energy angle and composition experiment PACE. When Kaguya stayed in the magnetotail, several well-defined multiple-onset substorms, which were identified by Pi2 pulsations on the ground and particle injections at synchronous orbit, occurred. For each onset of the multiple-onset substorm, a well-isolated plasmoid or traveling compression region (TCR) with duration of several minutes was observed. These observations indicate that magnetic reconnection starts and quenches over a period of several minutes for each onset. This complements the observations at radial distance of 20-30 Re by the spacecraft Geotail, since Geotail observes a tailward flow burst with negative Bz for each onset of a multiple-onset substorm. During the passage of the magnetotail by Kaguya, Geotail provided IMF conditions just upstream of the Earth without any timing ambiguity. The IMF conditions for these multiple-onset substorms are discussed.

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