Storm-substorm coupling during 16 hours of Dst steadily at -150 nT

Details Storm-substorm coupling during 16 hours of Dst steadily at -150 nT Storm-substorm coupling during 16 hours of Dst steadily at -150 nT

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0462p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0462

Physics

2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms

Scientific paper

We examine a storm event on October 21-22, 2001, which showed atypically long-lasting, steady depression of the Dst index. The magnetic storm was driven by an interplanetary magnetic cloud, whose sheath region behind the interplanetary shock drove the storm main phase with Dst decreasing to 150 nT within about four hours. The cloud proper had Bz close to zero at its leading edge and negative at the trailing edge. During the cloud passage, the Dst index stayed at about 150 nT, showing neither recovery during the zero IMF Bz nor further enhancement during the stronger driving during the negative IMF Bz. The magnetic indices as well as the Los Alamos energetic particle detectors onboard geosynchronous spacecraft indicate a series of substorms that could be identified in the ionosphere, at geosynchronous orbit, and in the magnetotail as individual activations. We discuss the magnetospheric dynamics that led to the steady Dst development for more than 16 hours: We consider the driving solar wind and IMF properties, analyze the substorms and their role in the longer-term evolution of the state of the magnetosphere, and evaluate the ring current intensity changes from space-borne observations. Finally, we discuss whether this steady behavior of the Dst index reflects steadiness of the ring current or continued balance of the various current systems contributing to the magnetic response recorded on the ground.

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