Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23b1398h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM23B-1398
Physics
2704 Auroral Phenomena (2407), 2744 Magnetotail, 2764 Plasma Sheet
Scientific paper
In the mganetotail perpendicular flows are generally believed to play an important role in the transport of magnetic flux, and some perpendicular fast flows can cause major auroral activities. However, the influence of parallel fast flows on auroral activities has not been studied extensively. In this study, we investigate relationships between nightside auroral activities and parallel fast flows in the plasma sheet for the period of 1997 and 1998. We first identify fast flow events from Geotail data using a criterion of |Vpara,x| > 300 km/s, where Vpara,x is the X component of the ion velocity parallel to the ambient magnetic fields. Then we quantitatively estimate the rate of change of auroral power over a region of 60-80 degrees MLAT and 2000-0400 hr MLT from Polar Ultraviolet Imager images for each event. We divide all the parallel fast flow events into two categories. Category I is the parallel fast events with the occurrence of the perpendicular fast flows and Category II is without the occurrence of the perpendicular fast flows. It is found that Category I have a better association with the increasing nightside auroral power than Category II. The relationship between Category II and nightside auroral activities is not apparent. It is also found that the rate of change of auroral power associated with the parallel fast flows is independent of the radial distance in the noon-midnight meridian.
Akimasa I.
Hsieh Michael
Shue J.
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