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Solar polar coronal hole - A mathematical simulationThe northern polar region of the sun was studied during July 1973 by Munro and Jackson through use of the white-light coronagraph and the X-ray photographs produced by the Skylab mission. They described the northern polar hole as nearly axisymmetric and gave the geometry and density distribution under this approximation. The present work gives quasi-radial approximation to the full magnetohydrodynamic equations for axisymmetric, polytropic solar wind flow to simulate this polar hole, with the benefit that model temperature and magnetic field intensities and distributions in this particular polar hole can be deduced. It is concluded that from 2 out to 5 solar radii the temperature varies only slightly with radius, but is larger near the center of the polar hole than at the edge. It is also found that the magnetic field intensity at 2 solar radii could be about 1 gauss at the center of the hole, decreasing toward the edge of the hole. If this is extrapolated to the surface, a field as high as 20 gauss is suggested.
Document ID
19770067733
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Suess, S. T.
(NOAA, Space Environment Laboratory; Colorado, University Boulder, Colo., United States)
Richter, A. K.
(Max-Planck-Institut fuer Aeronomie Katlenburg, Germany)
Winge, C. R.
(California, University Los Angeles, Calif., United States)
Nerney, S. F.
(NASA Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
October 1, 1977
Publication Information
Publication: Astrophysical Journal
Subject Category
Solar Physics
Accession Number
77A50585
Distribution Limits
Public
Copyright
Other

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