Lessons Learned from the THEMIS Major Conjunction on January 5, 2008

Details Lessons Learned from the THEMIS Major Conjunction on January 5, 2008 Lessons Learned from the THEMIS Major Conjunction on January 5, 2008

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1717g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1717

Physics

2721 Field-Aligned Currents And Current Systems (2409), 2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2764 Plasma Sheet, 2790 Substorms

Scientific paper

On January 5 2008, a strong substorm with a double onset occurred during a THEMIS 'major conjunction' in which the spacecraft were radially aligned in the magnetotail. The two distinct onsets, separated by 38 minutes are characterized both by space and ground observations. Pi2 pulsations and mid-latitude H bays provided essential measurements for accurate substorm timing and the determination of onset location. The substorm current wedges and the tail reconnection onset in the two events are located differently. The substorm current wedge is closer to the Earth and expands gradually after the first onset, while the second current wedge is located at higher latitudes and the onset of reconnection appears to be more tailward. The reconnection rate is higher at the second onset as evidenced by the faster depletion of tail lobe flux. This event teaches us more about multiple-onset substorms and demonstrates the important synergy between observations in space and on the ground. Both data types are essential for the correct interpretation of the events.

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