Investigation of Substorm Onset Trigging by Mutiple Satelltes

Details Investigation of Substorm Onset Trigging by Mutiple Satelltes Investigation of Substorm Onset Trigging by Mutiple Satelltes

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm31a1212h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM31A-1212

Other

2744 Magnetotail, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

ubstorms are so complex that many issues related to them remain very controversial. Many models have been proposed to explain substorm activity. These models can be broadly classified into two categories depending on the cause of the expansion onset. The first invokes processes in the near-Earth region (|X| < 15 Re) such as current sheet disruption, instability triggered by reduction of interplanetary electric field, or some feed back instabilities near the ionosphere. The other invokes mid-tail magnetic reconnection beyond |X| > 15 Re as a source of plasma flowing earthward. Deceleration of this earthward flowing plasma and pileup of magnetic flux pileup close to the Earth is then the cause of near-Earth disturbances. A possible way to distinguish the cause of substorm expansion onset is to examine the relative timing of magnetotail disturbances. If the near-Earth region is the source region of substorm onset, a disturbance should be first observed in the near-Earth region and later in the midtail. Similarly, the opposite time delay should be observed if the mid-tail reconnection is the source of substorm expansion onset. In this study, we have identified several candidate events with chance conjuctions of GOES, GEOTAIL, POLAR, and Cluster. Data from auroral imagers, ground magnetometers, Pi 2 pulsation detectors, and synchronous particle detectors will be used to establish accurate onset times. IMF observations will be accurately time propagated by Weimer et al [2003] algorithm. The starting time of near and mid-tail disturbance from these multi-satellite observation will be compared with substorm onset time to establish a relative timing pattern during substorms.

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