Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474l.139w&link_type=abstract
Astrophysical Journal Letters v.474, p.L139
Astronomy and Astrophysics
Astronomy
46
Interplanetary Medium, Sun: Solar Wind, Sun: Corona
Scientific paper
Recent progress in our understanding of electron density fluctuations observed by radio occultation measurements has demonstrated that a break in the vicinity of 1 Hz in the temporal frequency spectrum of the density fluctuations provides a measure of the size of the finest filamentary structures in the solar corona. Breaks in frequency have been inferred from the density spectra deduced by Coles et al. from 1979--1980 Voyager phase scintillation and spectral broadening measurements. These results show that the finest filamentary structures are found in the extensions or stalks of coronal streamers---the likely sources of the slow solar wind---and are over a factor of 3 smaller than those in the fast wind emanating from coronal holes. The inferred sizes of the finest filamentary structures are approximately 6 km in the slow wind at 8 Rsolar and 22 km in the fast wind at 9.1 Rsolar.
Rifai Habbal Shadia
Woo Richard
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