Tail-like reconfiguration of the plasma sheet during the substorm growth phase

Details Tail-like reconfiguration of the plasma sheet during the substorm growth phase Tail-like reconfiguration of the plasma sheet during the substorm growth phase

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2309k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Dec. 1990, p. 2309-2312.

Other

14

Magnetic Field Reconnection, Magnetic Storms, Magnetotails, Plasma-Electromagnetic Interaction, Polar Substorms, Earth Magnetosphere, Elastic Waves, Electric Fields, Interplanetary Magnetic Fields, Magnetosphere-Ionosphere Coupling

Scientific paper

Tail-like reconfiguration observed in the near-earth plasma sheet during the substorm growth phase is surrounded by enhanced convection except inside and tailward of the reconfiguration region itself. The required distribution of enhanced convection can be driven by an enhanced dayside reconnection. The enhanced dayside convection can be transmitted across open field lines by the tangential discontinuity to reach the last open field line in the tail lobe in about 20 minutes. This can cause Bx to increase in the plasma sheet. On the other hand, the enhanced dayside convection can also be transmitted across closed field lines by the fast rarefaction wave to arrive at the near-earth plasma sheet in about 15 minutes, causing Bz to decrease in the plasma sheet. Thus, a tail-like reconfiguration can start within about 15 to 20 minutes after a southward turning of the IMF. The duration of the growth phase can be identified with the M-I coupling time scale of 30 to 40 minutes.

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