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| Titel |
A case study of auroral conjugacy based on global imaging |
| VerfasserIn |
B. Krøvel Humberset, N. Østgaard, K. M. Laundal |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027965
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| Zusammenfassung |
| Simultaneous global imaging in the ultraviolet wavelength by the IMAGE and Polar satellites
gives unique tools to study the dynamics of the auroral ovals. When mapped onto apex
coordinates, one finds that the auroral features in the conjugate hemispheres usually
are not symmetric. Earlier studies have demonstrated a correlation between the
longitudinal asymmetry of certain auroral features and the BY component of the
interplanetary magnetic field (IMF), which is interpreted as a partial penetration of
the IMF into the closed magnetospheric field lines. In this study we use global
conjugate images obtained by IMAGE-FUV and VIS Earth cameras on 22 October
2001. The images form an unprecedented long time series that lasts for 5 hours
from 07.00 UT to 12.00 UT. We observe two substorms and reveal asymmetric
auroral features. During this time the IMF has a dominant negative BX component,
while the BY component is weaker and changes from negative to positive at the end
of the interval. We try to answer the question: How can the observed latitudinal,
longitudinal and intensity asymmetries be explained by the solar wind parameters? |
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