Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh22e06h&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH22E-06
Physics
2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind, 7509 Corona, 7524 Magnetic Fields
Scientific paper
Polarimetric measurements of the corona out to 2 Rs in the Fe XIII 10747 A line, the strongest of the iron forbidden lines, are placed for the first time in the context of spatially resolved images of coronal density structures. These measurements, which are the only tool currently available to yield the direction of the magnetic field, date to 1980, the only year when they were available with polarized brightness images of the corona. Through this comparison, the observed predominance of the radial component of the coronal magnetic field, discovered over three decades ago from eclipse observations, and established systematically by Arnaud (1982), is shown to point to the existence of two components of the coronal magnetic field: a non-radial component associated with the large scale structures known as streamers, and the second, more dominant one, a pervasive radial magnetic field. The coexistence of these two components provides new information for the distribution of open and closed magnetic flux in the solar corona.
Arnaud Jacques
Rifai Habbal Shadia
Woo Richard
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