Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confq..69h&link_type=abstract
California Univ., San Diego, International Solar Wind 8 Conference, p. 69
Astronomy and Astrophysics
Astronomy
Coronas, Heliosphere, High Temperature, Astronomical Maps, Iron Isotopes, Rotation, Sensitivity, Solar Rotation, Solar Observatories, Line Spectra, Spectral Methods
Scientific paper
The large-scale temperature structure of the low corona is investigated using synoptic temperature maps, derived from the intensity ratio of the green (Fe XIV) and red (Fe X) coronal lines as observed at the National Solar Observatory/Sacramento Peak. This intensity ratio is sensitive to coronal plasma with temperatures in the range of 1-2 MK. The synoptic maps indicate an association between high coronal temperature and the large-scale magnetic field. A comparison with WSO 'source surface' synoptic maps shows that especially when the heliospheric current sheet is stable over several rotations, the large-scale high-temperature features follow the current sheet remarkably well. For recent Carrington rotations temperature maps have been constructed for various heights between 1.15 and 1.45 solar radii. For these maps the correspondence with the current sheet (calculated at 2.5 solar radii) improves with height. Deviations between temperature structure and magnetic structure appears to be largest when the magnetic structure changes rapidly from rotation to rotation.
Altrock Richard
Hick Pierre P.
Jackson Bernard V.
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