The Interrelationship of auroral onset, dipolarization, fast flow, and injection
Abstract
Using a variety of ground-based instruments/techniques we are now able to quantify the location of certain magnetospheric boundaries and phenomena. These include: (1) the equatorward boundary of the proton aurora (428nm), which is believed to represent the inner edge of a strong pitch angle scattering region determined by the magnetic topology. Across this boundary the magnetic field changes from a tail-like to dipolar-like, (2) The poleward edge of the 630nm (redline) aurora which is believed to correspond to the ionospheric footprint of the open-closed field line boundary, and (3) sudden rises in riometer absorption that have been connected to the onset of dispersionless injection at a given location. Using the THEMIS-ASI array, the NORSTAR Multispectral ASI array, the CGSM photometers and riometers we place the auroral breakup and onset of dispersionless injection relative to these magnetospheric locations. In this paper, we combine information provided by these ground-based arrays with the THEMIS satellite data in an effort to elucidate the relationship between aurora breakup, dispersionless injection, dipolarization and magnetospheric fast flow.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2009
- Bibcode:
- 2009AGUSMSM21A..02S
- Keywords:
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- 2716 Energetic particles: precipitating;
- 2790 Substorms