Statistics – Computation
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..991...10f&link_type=abstract
PROCEEDINGS OF THE NATIONAL SOCIETY OF BLACK PHYSICISTS: 34th Annual Day of Scientific Lectures & 30th Annual Meeting: 2007 Join
Statistics
Computation
1
Eclipses, Transits, And Occultations, Particle Emission, Solar Wind, Space-Based Ultraviolet, Optical, And Infrared Telescopes, Astronomical Observations, Corona
Scientific paper
Polar plumes, plasma structures along open magnetic field lines in solar coronal holes, have long been thought to contribute to the solar wind. The aim of this work is to determine if solar eclipse and space-based line intensity observations of plumes may be used to determine if deviations from hydrostatic equilibrium can be observed in plumes. We have obtained observations of the March 29, 2006 total solar eclipse from Cape Coast, Ghana and simultaneous coronal filtergrams from the Extreme-ultraviolet Imaging Telescope aboard the Solar and Heliospheric Observatory. We have developed a one-dimensional hydrodynamic computational plume model to test against the observations. We performed a parameter study in which the plumes' basal temperatures (20,000 K) and thermal conductive flux were fixed while other parameters of the model including the base velocity (from 105-104 cm.s-1), base pressure (from 1014-1015 K.cm-3), scale height (from 0.05-1.00 Rs) and heating rate(from 10-1-10-5 ergs.cm-2.s-1) were varied, we calculated the predicted intensity decay rates for solutions in which coronal temperatures were reached and compared these calculated values to our observations. We find that the hydrostatic model does not predict decay rates comparable to the observed data (the model predicts rates much larger than the observations) suggesting that the plumes we observed are likely dynamic structures. The model was able to indicate constraints on the heating scale height and on heating rates for plume models. We discover that decreasing the heating rate will produce small decay rates, while a change in the scale height does not have an effect on the model's ability to predict decay rates.
Farid S. I.
Oluseyi Hakeem M.
Sterling Sarah
Tan Aihong
Williamson Jessica L.
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