Study of the June 30, 1973 trans-polar coronal hole

Details Study of the June 30, 1973 trans-polar coronal hole Study of the June 30, 1973 trans-polar coronal hole

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...51..399k&link_type=abstract

Solar Physics, vol. 51, Mar. 1977, p. 399-407.

Physics

49

Coronagraphs, Far Ultraviolet Radiation, Solar Corona, Spectroheliographs, Stellar Models, Polar Regions, Solar Eclipses, Solar Electrons, Solar Temperature

Scientific paper

Radially and tangentially polarized pictures of the solar corona obtained near 4500 A during the 30 June, 1973 solar total eclipse have been used to derive a model of a trans-polar coronal hole. The hole is identified by using OSO-7 EUV spectroheliograms. The line of sight coincides with the privileged plan of the hole over the N-polar region. A new method of absolute calibration is used. The Saito (1970) method is applied to determine the electron densities. Extrapolated values of densities down to the surface are lower than have ever been observed although derived hydrostatic temperatures are certainly not: an electron density of 1.8 x 10 to the 7th/cu cm and temperature of 2 x 10 to the 6th K. The morphological peculiarities of polar regions are considered.

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