The Relationship Between Storms, Substorms, and ``Steady Magnetospheric Driving'' Events

Details The Relationship Between Storms, Substorms, and ``Steady Magnetospheric Driving'' Events The Relationship Between Storms, Substorms, and ``Steady Magnetospheric Driving'' Events

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm41a07h&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM41A-07 INVITED

Physics

2704 Auroral Phenomena (2407), 2730 Magnetosphere--Inner, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

One of the longest standing unresolved problems in magnetospheric physics has been the determination of the role that individual substorms play in the development of geomagnetic storms. From early on it was noted that storms were typically comprised of a number of smaller, more elemental episodes of activity and each of these events were therefore referred to as ``sub-storms''. Thus, the (unavoidable) conclusion for a long time was that storms are the accumulated effect of many individual substorms (it had to be this way almost by definition). However, since the term ``sub-storm'' was coined, we have learned a great deal more about the substorm process and as a result, there are now two main competing ideas about their role in magnetic storms. The first view is the traditional one -- that storms arise as a result of the combined effect of a number of individual substorms. The second view is that storms are predominantly due to large increases in magnetospheric convection and that substorms play an auxiliary role in this process. In this paper, we utilize magnetospheric imagery from the Polar and IMAGE spacecraft in order to address the question of the role that individual substorms play in the development of magnetic storms. And we will also present observations illustrating how ``steady magnetospheric driving'' events are related to both storms and substorms.

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