Transpolar arc evolution and associated potential patterns
We present two event studies encompassing detailed relationships between plasma convection, field-aligned current, auroral emission, and particle precipitation boundaries. We illustrate the influence of the Interplanetary Magnetic Field <i>B<sub>y</sub></i> component on t...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2004-04-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/22/1213/2004/angeo-22-1213-2004.pdf |
| Summary: | We present two event studies encompassing detailed relationships between plasma
convection, field-aligned current, auroral emission, and particle precipitation
boundaries. We illustrate the influence of the Interplanetary Magnetic Field <i>B<sub>y</sub></i>
component on theta aurora development by showing two events during which the
theta originates on both the dawn and dusk sides of the auroral oval. Both theta then
move across the entire polar region and become part of the opposite side of the
auroral oval. Electric and magnetic field and precipitating particle data are provided
by DMSP, while the Polar UVI instrument provides measurements of auroral
emissions. Utilizing satellite data as inputs, the Royal Institute of Technology model
provides the high-latitude ionospheric electrostatic potential pattern calculated at
different times during the evolution of the theta aurora, resulting from a variety of
field-aligned current configurations associated with the changing global aurora.<br><br>
<b>Key words.</b> Ionosphere (auroral ionosphere; electric fields
and currents). Magnetospheric physics (magnetosphereionosphere
interactions) |
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| ISSN: | 0992-7689 1432-0576 |