Physics – Optics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.q1003p&link_type=abstract
American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #Q1.003
Physics
Optics
Scientific paper
The corona of the Sun, visible during an eclipse of the Sun, has been a challenge to physics for more than a century, and, for all the scientific progress, the dynamical microstructure of the corona is only beginning to be revealed. To begin, there are three distinct states of the million degree coronal gas: The weak-field coronal hole, and the strong field, X-ray emitting, bipolar magnetic regions, and the active corona surrounding the bipolar regions. Their origin leads into the microworld of the magnetic fields, with the intense magnetic fibrils at the visible surface, the magnetic carpet, and the interlaced bipolar field lines, with the associated nanoflares, microflares, and flares, and all with internal scales of 100 km or less. Unfortunately 100 km is well below the limit of resolution of existing telescopes. An essential step forward is the proposed Advanced Technology Solar Telescope, a 4m ground based telescope with adaptive optics providing resolution down to 50 km, together with rapid cadence, high dispersion spectroscopy to follow the action.
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