Empirical constraints on O(5+) outflows and velocity distributions in a solar-minimum coronal streamer

Details Empirical constraints on O(5+) outflows and velocity distributions in a solar-minimum coronal streamer Empirical constraints on O(5+) outflows and velocity distributions in a solar-minimum coronal streamer

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt.........7f&link_type=abstract

Thesis (PhD). UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN, Source DAI-B 63/02, p. 837, Aug 2002, 199 pages.

Computer Science

4

Scientific paper

The three dimensional distribution of the electron density in the solar minimum corona from 2.4 to 6.0 R&sun; is determined via the robust, regularized, positive estimation (RRPE) tomography method applied to a time series of polarized white-light images taken by the Large Angle and Spectrometric Coronagraph Experiment (LASCO). The LASCO images are supported by inter- comparisons with the Ultraviolet Coronagraph Spectrometer White Light Channel (UVCS/WLC) and in-flight calibration of the UVCS/WLC. As part of an effort to understand how the solar wind is energized, the so-determined electron density is used to interpret O VI λ1032, 1037 Å spectra taken with UVCS. The spectra are interpreted in terms of empirical constraints on the O5+ ion velocity distributions and outflow speeds. Four conclusions result from this work: (1)our analysis shows O5+ velocity distribution anisotropy in the streamer legs and stalk and also shows that the microscopic velocity distribution (which excludes wave motions that equally affect all charged particles) is anisotropic, where the most probable speed perpendicular to the magnetic field direction exceeds that in the parallel direction; (2)there is preferential heating of the O5+ ions over the protons in the streamer stalk and legs; (3)there is no evidence for preferential O5+ heating in the core; (4)the outflow velocity of the O5+ ions is determined at heights above 4.6 R&sun; . All results have a confidence level of at least 70%.

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