Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm52a12b&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM52A-12
Physics
2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2760 Plasma Convection, 2776 Polar Cap Phenomena
Scientific paper
Transient (5-15 min) intensifications and motion of the dayside aurora has been observed on both small (all-sky camera) and large (spacecraft remote sensing) scales although the relationship between what is observed at these disparate scales is not yet understood. Our study of these features using the Ultraviolet Imager on the Polar spacecraft at 37 s time resolution has found that the post-noon aurora brightens and develops a separate poleward-moving arc structure over several MLT. This occurs under typically southward Bz and By positive IMF conditions. We show that this phenomenon does not always occur during these solar wind conditions but significant auroral activity in the dusk region is prerequisite for the intense dayside auroral splits observed by Polar. We present particle and electric field data from the FAST satellite in conjunction with UVI and solar wind observations indicating that the dayside oval and the transient poleward branch occur in regions of strong longitudinal convection. Also, the ions and electrons show similar energy spectrum characteristics. We show that the intense transient events observed from space depend on both the state of the magnetosphere and the plasma sheet in particular and that they are not exclusively controlled by the solar wind.
Brittnacher M.
Parks George K.
Peria W.
Roberson B. R.
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