Physics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.3603t&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A3, p. 3603-3614
Physics
26
Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Storms And Substorms
Scientific paper
We observe large ion outflow fluxes (>108cm-2s-1 mapped to 100 km) flowing from the auroral polar cap boundary on many FAST auroral passes near midnight. The outflow is in the form of ion conics composed mostly of light ions with energies of hundreds of eV. A statistical study of 606 FAST orbits during January and February 1997 was done to determine the MLT distribution and ion outflow properties relative to substorms. We find that the ion conic events occur most frequently near midnight, and therefore their direct magnetic connection to the nightside central plasma sheet makes this ion outflow a candidate for the ionospheric source of the nightside plasma sheet. To study the relationship between the ion conic outflow events and auroral substorm conditions, we use global auroral images acquired from the ultraviolet imager (UVI) on Polar. We find that the outflow events are well correlated with substorm expansion phase, but ion conic outflow events also occur during generally active aurora, when onset and expansion phases were not clearly identifiable. By combining FAST data to determine ion outflow fluxes and ILAT extent and Polar UVI images to determine MLT extent, we estimate the total outflow due to these ion conic events to be 1022 to 1024ions/s. By comparing with earlier ion outflow studies, we conclude that these polar cap boundary ion conic events are not the dominant or only ionospheric source of ion outflow over the entire auroral oval but are the dominant nightside auroral ion outflow.
Carlson Carl W.
Klumpar D. M.
Liou Kan
McFadden James P.
Parks George K.
No associations
LandOfFree
Auroral polar cap boundary ion conic outflow observed on FAST does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Auroral polar cap boundary ion conic outflow observed on FAST, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Auroral polar cap boundary ion conic outflow observed on FAST will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1008622