Computer Science – Sound
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm53c..03b&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM53C-03
Computer Science
Sound
2704 Auroral Phenomena (2407), 2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
We investigate the causes of low energy (<20 eV), or ``core'', ion upflows in Earth's cusp. The CUSP-2002 sounding rocket flew from Ny Alesund, Svalbard, on 14~December 2002, carrying a complement of instrumentation within the cusp to an altitude of 772~km. The Suprathermal Ion Imager (SII), a two-dimensional energy/arrival angle ion spectrograph, observed large {O}+ outflows within the cusp at altitudes as low as 500~km, while the ion kinetic temperature remained isotropic near 0.1--0.2 eV for the entire event. The upflow data exhibit clear transitions that correlate with the cusp boundary layer between closed and open magnetic field lines. We attempt to explain the time-evolution of these upflows by examining the effectiveness of the observed precipitating magnetosheath electron flux as a driver under the prevailing solar wind conditions. These observations provide quantitative information on the time-dependent response of polar ion upflow to soft electron precipitation, and offer an excellent opportunity for comparison with numerical models of ion outflow.
Burchill J. K.
Clemmons James Hart
Knudsen David J.
Pfaff Robert F.
Steigies Christian T.
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