Determining the Relative Importance of Ionospheric Parameters to Ion Upwelling using Multivariate Analysis

Details Determining the Relative Importance of Ionospheric Parameters to Ion Upwelling using Multivariate Analysis Determining the Relative Importance of Ionospheric Parameters to Ion Upwelling using Multivariate Analysis

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm52f..04r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM52F-04

Physics

2423 Ionization Mechanisms, 2431 Ionosphere/Magnetosphere Interactions (2736), 2451 Particle Acceleration, 2494 Instruments And Techniques, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

The O+ content in the magnetospheric plasma sheet varies highly with magnetic activity. Because of the mass difference between H+ and O+, the plasma parameters that determine the behavior of the plasma in the magnetosphere, will also be highly variable. This O+ can only come from the earth's ionosphere. In order for the O+ to reach the magnetosphere from the ionosphere it must undergo heating in 2 different regimes: first bulk upwelling in the ionosphere, then filamentary heating at altitudes close to the auroral acceleration region. While H+ ions are light enough to easily boil off, O+ ions reside lower in the ionosphere and need to over come gravity and make it through the charge exchange region located at ~800 Km. This study uses incoherent scatter radar and multivariate statistical analysis to look at the first step; the bulk upwelling in the ionosphere. It uses field-aligned data from 3 radar facilities to look at the 400-800 km altitude region, and multivariate analysis to determine the ionospheric parameters most associated with variation in upward ion flux. There are a whole zoo of mechanisms that could be responsible for the upwelling ions, each with their own effects on the ionospheric parameters. By determining which parameters are associated with upward ion flux, we can narrow down which mechanisms are dominant in each region. This is an important step in understanding both the mechanics of the ionosphere, and the ionospheric input into the magnetosphere.

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