Sawtooth substorm injections, their triggering, and their ionospheric signatures during the April 2002 storm

Details Sawtooth substorm injections, their triggering, and their ionospheric signatures during the April 2002 storm Sawtooth substorm injections, their triggering, and their ionospheric signatures during the April 2002 storm

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0451h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0451

Physics

2435 Ionospheric Disturbances, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

During the April 2002 storm, geosynchronous satellites measured periodic particle injections from the magnetotail to the inner magnetosphere. The particle fluxes exhibited a well-defined "sawtooth" profile with gradual decreases (flux dropouts) followed by rapid increases (injections). The sawtooth injections represent the signatures of periodic substorms. Each flux dropout corresponds to the growth phase of a substorm, and each flux increase corresponds to a substorm onset. Magnetospheric electric fields associated with substorms penetrate to the middle- and low-latitude ionosphere and cause disturbances in the F region plasma density and E region currents. We will present observations of the solar wind, magnetospheric magnetic fields, geosynchronous plasma fluxes, and ionospheric plasma density and currents, and discuss the relationship among perturbations in the solar wind, magnetosphere, and ionosphere in this event. We will also discuss several outstanding problems in magnetospheric substorms, such as what causes onsets of periodic substorms during magnetic storms, whether substorms have some specific periodicity, and what determines the periodicity.

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