Space- and ground-based observations of the structure and dynamics of the auroral ionosphere during an interval of dawnward interplanetary magnetic field

Details Space- and ground-based observations of the structure and dynamics of the auroral ionosphere during an interval of dawnward interplanetary magnetic field Space- and ground-based observations of the structure and dynamics of the auroral ionosphere during an interval of dawnward interplanetary magnetic field

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3637w&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3637

Computer Science

Scientific paper

During the interval 12-17 UT on 8th December 2001, the IMF was generally oriented in the dawnward direction with By varying between -3 and -6 nT. The Bz component was typically smaller throughout (|Bz| < 4 nT) and negative until around 14:30 UT (lagged time) when it switched to positive values. This northward turning resulted in an IMF clock angle of approximately -80 degrees, which endured until the end of the interval. We will present data from a number of space- and ground-based instruments during this interval including SuperDARN, Cluster, FAST, DMSP and IMAGE WIC. The observations of the high-altitude particle environment above the polar region and the convection flow pattern in the high-latitude ionosphere are used to infer the location of the open/closed field line boundary during an interval in which the solar wind-magnetosphere-ionosphere coupling mechanism departed markedly from the ubiquitous southward IMF paradigm. Furthermore, the location of the boundary is compared with that of auroral emissions at ultraviolet wavelengths measured by orbiting imagers in order to investigate how effectively the poleward limit of the UV aurora can be employed as a proxy for the open/closed field line boundary.

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