Other
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt.........1e&link_type=abstract
Thesis (PhD). UNIVERSITY OF ALABAMA IN HUNTSVILLE, Source DAI-B 62/05, p. 2366, Nov 2001, 150 pages.
Other
1
Scientific paper
In this work ion outflow in the polar cap magnetosphere is studied using the Thermal Ion Dynamics Experiment (TIDE) instrument on the POLAR satellite. Prior to interpretation of ion outflow observations, the calibration data were analyzed, then used to calibrate TIDE data and cross comparisons were made with data from other instruments. The data analysis has two main parts; a statistical study and a case study. The solar wind and interplanetary magnetic field (IMF) data are extrapolated to the subsolar magnetopause position, and are correlated with properties of O+ and H+ derived from TIDE measurements. The O+ density and parallel flux are well organized by solar wind dynamic pressure, both increasing with solar wind dynamic pressure. The O+ density has positive correlations with both VSWBIMF and ESW. H+ is not as highly correlated with solar wind and IMF parameters as O +. These results from the statistical study provide useful information which, when compared with previous studies in different magnetospheric regions, indicate possible source regions in the ionosphere and provide evidence for parts of the overall circulation of ionospheric ions in the magnetosphere. In a case study of April 19, 1996, elevated levels of O+ are observed, which may be due to the geophysical conditions during and prior to the apogee pass. Relationships between the density, velocity, and temperature are observed which appear to be associated with perpendicular heating and the mirror force, rather than adiabatic expansion. The polar cap Poynting flux along the magnetic field direction correlates well with the H + temperature. A distinguishing feature of this pass is that both the H+ and O+ outflow velocities correlate with both the solar wind speed and IMF fluctuations. POLAR magnetic field data show variations similar to those observed in the solar wind and polar cap ion outflow. The question of whether or not the relationships between the solar wind, ion outflow, and polar cap magnetometer fluctuations indicate that the ion outflow is directly driven by the solar wind is examined. Aspects of the case study results seem to support ion outflow being related to the solar wind through heating/wave-particle heating, through currents forming field-aligned potential drops, or both.
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