Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41a..04h&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM41A-04
Physics
2704 Auroral Phenomena (2407), 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2788 Storms And Substorms
Scientific paper
During intervals of prolonged moderate but steady southward IMF Bz, the magnetosphere frequently enters a state in which quasi-periodic, large-amplitude, global oscillations are observed in the geosynchronous energetic particle fluxes. These oscillations have been termed ``sawtooth events" because their shape -- a series of slow flux decreases followed by rapid increases -- resemble the teeth of a saw blade. Recent studies of sawtooth events have shown that each of the flux increases are associated with characteristic substorm onset signatures including field dipolarization, injection of energetic particles, ground magnetic perturbations, and embedded auroral onsets. Thus, it has been shown that sawtooth events are actually a sequence of recurrent quasi-periodic substorms. In addition, the level of solar wind driving necessary to induce sawtooth behavior appears to be transitional between driving levels that give rise to SMC (steady magnetospheric convection) and full-blown storm type behavior. Sawtooth events can therefore be viewed as a magnetospheric mode similar to SMCs except that for sawtooth events, the flow of energy from the solar wind into the magnetosphere becomes too large to dissipate without the (literally) periodic occurrence of substorms. I.e., the magnetosphere is continuously ``driven'' toward substorm-like reconfigurations in order to ``reset'' itself at periodic intervals. In this presentation we examine the possibility that during such long-lived, predominantly driven events, the energy input to the ionosphere/atmosphere system is greatly enhanced by the continuously driven auroral disturbances that occur.
Borovsky Joseph
Henderson Gideon M.
Immel Thomas J.
Lui A. T.
Mende Stephen B.
No associations
LandOfFree
Magnetospheric and Auroral Activity during Sawtooth Events: Energy Flow Through the MIA system During Periodic Magnetospheric Disturbances does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetospheric and Auroral Activity during Sawtooth Events: Energy Flow Through the MIA system During Periodic Magnetospheric Disturbances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetospheric and Auroral Activity during Sawtooth Events: Energy Flow Through the MIA system During Periodic Magnetospheric Disturbances will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1649666